Is Lice Plural or Singular? Understanding the Term’s Grammatical Number
Quick Answer
Lice is plural (more than one). The singular is louse. One louse, two lice. Do not add -s — “louses” is not correct.
Louse and Lice — See the Pattern
Look at these sentences. Can you see when we use louse and when we use lice?
- The nurse found one louse in his hair.
- There are lice in the classroom this week.
- A single louse can lay many eggs.
- Head lice are very common in schools.
Did you see the pattern? We use louse for one, and lice for two or more. The word changes completely — we do not just add -s.
| Singular (one) | Plural (more than one) |
|---|---|
| louse | lice |
When to Use Louse and When to Use Lice
The rule is simple:
- Use louse when you talk about one — “I found a louse.”
- Use lice when you talk about two or more — “I found lice.”
- Do NOT add -s. “Louses” is not correct in English.
This is called an irregular plural. Most English words add -s to become plural (cat → cats, bug → bugs). But “louse” does not follow that rule. The middle of the word changes: the “ou” sound becomes an “i” sound.
Easy way to remember: Think of “ice.” L + ice = lice. If you can say “ice,” you can say “lice.”
The Rule in One Line: One louse, two lice — change the -ouse to -ice.
How to Use Louse and Lice in Everyday English
- The school sent a letter home about head lice. (= more than one)
- I found a louse on my daughter’s pillow. (= one insect)
- You need special shampoo to get rid of lice. (= lice in general)
- Even one louse means you should start treatment. (= one specific insect)
- Do not share hats or combs — lice can spread easily. (= lice in general)
You are doing great. Now let us look at the mistakes many learners make.
The Most Common Mistake With Louse and Lice
Many English learners add -s and say “louses.” This is completely normal. Even native speakers’ children say “louses” when they are learning to talk. So if you make this mistake, you are not alone.
✗ There are louses in her hair.
✓ There are lice in her hair.
✗ I found a lice on my head.
✓ I found a louse on my head.
How to remember: Lice rhymes with ice, rice, and nice. Say it out loud: “lice, ice, rice, nice.” That sound will stick in your head.
Other words that change like this: mouse → mice, goose → geese, man → men, tooth → teeth, foot → feet. These are all irregular plurals — the word changes instead of adding -s.
Test Yourself: Louse or Lice?
Choose the correct answer for each sentence. Click Check to see if you are right.
1. I found a _______ in my daughter’s hair.
2. Head _______ are very common in schools.
3. The nurse checked every child for _______.
4. Can a single _______ make your head itch?
5. We need special shampoo to get rid of the _______.
Keep Going — You Are Building Something
You just learned the difference between louse and lice. That is one more irregular plural you will never get wrong again.
But here is something interesting. You know that louse becomes lice. So what about mouse? Does it become “mouses”? No — it follows the exact same pattern. The -ouse changes to -ice. Can you guess what the plural of mouse is?
Next lesson: Plural of Mouse Explained: Why It’s Not Mouses
Source
My name is Khamis Maiouf. I am the creator of the English Teacher Site, dedicated to providing valuable resources and insights for students around the world. With a passion for education and a commitment to helping students enhance their skills, I aim to make English teaching more effective and enjoyable for both educators and students.
