Why does the "L" sound disappear in some Arabic words but not others?

The disappearance of the "L" sound in the prefix "al-" is a phonetic process called assimilation. It occurs when the letter following the prefix is a "Sun letter," which is produced in the same part of the mouth as the "L" (the tip of the tongue near the upper teeth). To avoid a "linguistic traffic jam" caused by the tongue hitting the same spot twice, the "L" melts into the next letter. Conversely, "Moon letters" are produced in different areas of the mouth, such as the throat or lips, allowing the "L" to be pronounced clearly without any physical interference.

How can I easily remember which letters are Sun letters and which are Moon letters?

The most efficient way to distinguish between the two groups is to memorize a single mnemonic phrase for the 14 Moon letters: *Ibgh Hajjaka wa Khaf 'Aqimahu*. If a word starts with any letter found in this phrase, the "L" remains clear. If the starting letter is not in that phrase, it is a Sun letter, and the "L" should be silenced. Additionally, you can use the celestial metaphor: the Sun is so bright it "hides" the "L" (making it silent), while the Moon is a gentle light that lets the "L" shine alongside it.

What are the visual cues for these rules when reading Arabic text?

In traditional Quranic script, a Moon letter is indicated by a small circle called a *Sukoon* placed directly over the "L," signaling a clear and distinct pronunciation. For Sun letters, the "L" is left "naked" with no mark, and the following letter will have a small "w" shape called a *Shaddah* above it. This *Shaddah* is a visual instruction to skip the "L" and double the sound of the next letter. While these marks are often omitted in modern newspapers or street signs, the spelling of the "al-" prefix remains the same regardless of how it is pronounced.

What is a "Shaddah" and why is it important for Sun letters?

A *Shaddah* represents the physical doubling of a consonant sound. When a Sun letter "swallows" the "L" from the prefix, it gains the "energy" of that missing letter, resulting in a stronger, emphasized sound. For example, instead of saying "al-shams," you say "ash-shams," lingering on the "sh" sound. A common mistake for beginners is to mute the "L" but fail to double the next letter, which makes the word sound "thin" and can sometimes change its meaning or make it difficult for native speakers to understand.

Arabic Sun and Moon Letters: Why the 'L' Vanishes

30 min

Apr 6, 2026

Education Communication skill Science

Struggling with the 'al-' prefix in Arabic? Learn the simple logic behind Sun and Moon letters so you can stop mispronouncing words and speak fluently.

Best quote from Arabic Sun and Moon Letters: Why the 'L' Vanishes

The sun is so bright that it 'overwhelms' everything near it—just like a Sun letter overwhelms the 'L' and makes it disappear. The moon is a 'gentle' light that doesn't hide the stars, so the Moon letter lets the 'L' shine right next to it.

This audio lesson was created by a BeFreed community member

Input question

Demystifying sun and moon word in Arabic

Host voices

Lena

Miles

Learning style

Deep

Knowledge sources

Frequently Asked Questions

From Columbia University alumni built in San Francisco

BeFreed Brings Together A Global Community Of 1,000,000 Curious Minds

See more on how BeFreed is discussed across the web

"Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."

@Moemenn

"I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."

@Chloe, Solo founder, LA

117

"Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."

@Raaaaaachelw

"Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."

@Matt, YC alum

108

"Reading used to feel like a chore. Now it’s just part of my lifestyle."

@Erin, Investment Banking Associate , NYC

254

"Feels effortless compared to reading. I’ve finished 6 books this month already."

@djmikemoore

"BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."

@Pitiful

4.5K

"BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."

@SofiaP

"BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"

@Jaded_Falcon

201

"It is great for me to learn something from the book without reading it."

@OojasSalunke

"The themed book list podcasts help me connect ideas across authors—like a guided audio journey."

@Leo, Law Student, UPenn

483

"Makes me feel smarter every time before going to work"

@Cashflowbubu

From Columbia University alumni built in San Francisco

BeFreed Brings Together A Global Community Of 1,000,000 Curious Minds

See more on how BeFreed is discussed across the web

"Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."

@Moemenn

"I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."

@Chloe, Solo founder, LA

117

"Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."

@Raaaaaachelw

"Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."

@Matt, YC alum

108

"Reading used to feel like a chore. Now it’s just part of my lifestyle."

@Erin, Investment Banking Associate , NYC

254

"Feels effortless compared to reading. I’ve finished 6 books this month already."

@djmikemoore

"BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."

@Pitiful

4.5K

"BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."

@SofiaP

"BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"

@Jaded_Falcon

201

"It is great for me to learn something from the book without reading it."

@OojasSalunke

"The themed book list podcasts help me connect ideas across authors—like a guided audio journey."

@Leo, Law Student, UPenn

483

"Makes me feel smarter every time before going to work"

@Cashflowbubu

"Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."

@Moemenn

"I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."

@Chloe, Solo founder, LA

117

"Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."

@Raaaaaachelw

"Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."

@Matt, YC alum

108

"Reading used to feel like a chore. Now it’s just part of my lifestyle."

@Erin, Investment Banking Associate , NYC

254

"Feels effortless compared to reading. I’ve finished 6 books this month already."

@djmikemoore

"BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."

@Pitiful

4.5K

"BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."

@SofiaP

"BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"

@Jaded_Falcon

201

"It is great for me to learn something from the book without reading it."

@OojasSalunke

"The themed book list podcasts help me connect ideas across authors—like a guided audio journey."

@Leo, Law Student, UPenn

483

"Makes me feel smarter every time before going to work"

@Cashflowbubu

"Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."

@Moemenn

"I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."

@Chloe, Solo founder, LA

117

"Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."

@Raaaaaachelw

"Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."

@Matt, YC alum

108

"Reading used to feel like a chore. Now it’s just part of my lifestyle."

@Erin, Investment Banking Associate , NYC

254

"Feels effortless compared to reading. I’ve finished 6 books this month already."

@djmikemoore

"BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."

@Pitiful

4.5K

"BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."

@SofiaP

"BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"

@Jaded_Falcon

201

"It is great for me to learn something from the book without reading it."

@OojasSalunke

"The themed book list podcasts help me connect ideas across authors—like a guided audio journey."

@Leo, Law Student, UPenn

483

"Makes me feel smarter every time before going to work"

@Cashflowbubu

1.5K Ratings4.7

Start your learning journey, now

Arabic Sun and Moon Letters: Why the 'L' Vanishes

30 min

Apr 6, 2026

Education Communication skill Science

Struggling with the 'al-' prefix in Arabic? Learn the simple logic behind Sun and Moon letters so you can stop mispronouncing words and speak fluently.

Best quote from Arabic Sun and Moon Letters: Why the 'L' Vanishes

The sun is so bright that it 'overwhelms' everything near it—just like a Sun letter overwhelms the 'L' and makes it disappear. The moon is a 'gentle' light that doesn't hide the stars, so the Moon letter lets the 'L' shine right next to it.