What’s the Plural of Antenna: Understanding Singular and Plural Forms

Antennae or Antennas — See the Difference

Look at these four sentences. Watch the word in blue. Is the writer talking about a bug or a device?

• The butterfly waved its antennae in the air. (insect)
• Old houses often had two antennas on the roof. (devices)
• The ant’s antennae help it follow a smell. (insect)
• This Wi-Fi router has four small antennas. (devices)

Did you see the pattern? When we talk about a living thing, we use antennae. When we talk about a machine, we use antennas. Both words are correct — they just mean different things.

Why Antenna Has Two Plurals

Most English words just add -s to become plural — like book → books. But “antenna” came from Latin, an old language. In Latin, words ending in -a become plural by changing to -ae.

So the old Latin plural is antennae (say it like “an-TEN-ee”). English keeps this old plural for the biology meaning — the feelers on insects, spiders, and crabs.

• One ant has two antennae.
• A lobster’s antennae are very long.

But when we use the same word for a radio or TV device, English drops the old rule and follows the normal English rule — just add -s. So we say antennas.

• The tower has six radio antennas.
• Modern phones have tiny antennas inside.

Easy way to remember: If it is alive, use antennae. If it is plugged in, use antennas.

Real-Life Examples With Antenna, Antennae, and Antennas

Here are sentences you might say or read in everyday life:

• “That moth’s antennae look like little feathers.” (insect — use antennae)
• “Our old TV needed two big antennas to work.” (devices — use antennas)
• “The crab moved its antennae to feel the rocks.” (sea animal — use antennae)
• “Cell towers have many antennas for different signals.” (machines — use antennas)
• “My son drew an ant with three antennae by mistake.” (insect — use antennae, but real ants only have two!)

You are doing great. Now let’s look at the mistakes many learners make.

Three Mistakes to Avoid With Antennae and Antennas

Even native speakers mix these up — many people write “antennas” for everything because it feels more “English”. So if this feels confusing, you are not alone. The trick is to ask yourself one question: Is it alive, or is it a machine?

How to remember: Before you choose, picture the thing in your head. Is it moving on its own (a bug, a crab)? Use antennae. Is it sitting on a roof or a phone? Use antennas.

One small note: Some science books also use antennae for old, very long radio devices. This is rare today. In normal life, stick with the simple rule above and you will be right almost every time.

Other Latin words that keep their old plural in science:

• one larva → many larvae (baby insects)
• one vertebra → many vertebrae (bones in your back)
• one formula → many formulae (in math, also “formulas”)

Test Yourself: Antennae or Antennas?

Choose the correct answer for each sentence. Click Check to see if you are right.

Keep Going — You Are Building Something

You just learned when to say antennae and when to say antennas. That is one more old Latin word you will never get wrong again.

And here is something fun. Antenna is not the only sea creature word that breaks the rules. Think about the eight-armed animal in the ocean. When you see two of them, do you say “octopuses” — or do you say something stranger? Most people get this one wrong, and the answer might surprise you.

Next lesson: What’s the Plural of Octopus? The Answer Is Not What You Think

Sources

1. Cambridge Dictionary: definition of antenna.
2. Etymology of antenna.

Khamis Maiouf

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.