An Encylopedia Britannica Company

Learner's Dictionary mobile search

×

Learner's Dictionary

aphid

1 ENTRIES FOUND:

aphid (noun)

Save

aphid /ˈeɪfəd/ noun

plural aphids

aphid

/ˈeɪfəd/

noun

plural aphids

Learner's definition of APHID

[count]

: a very small insect that harms plants

Comments & Questions

Comments & Questions

What made you want to look up aphid? Include any comments and questions you have about this word.

ASK THE EDITOR

What is the grammatical difference between "home" and "house"?

See the answer »

LEARNER'S QUIZZES

Vocabulary Quiz Icon

Vocabulary Quiz

Test your word power

Take the Quiz »

Name That Thing Icon

Name That Thing

Take our visual quiz

Test Your Knowledge »

LEARNER'S WORD OF THE DAY

Dedicated Illustration

: having very strong support for or loyalty to a person, group, cause, etc.

Learn More »

The Merriam-Webster
Unabridged Dictionary

Merriam-Webster Unabridged Book Cover

Online access to a
legendary resource
Log In or Sign Up »

Learning Spanish?
We can help

Learner's Dictionary Book Cover

Visit our free site designed
especially for learners and
teachers of Spanish
SpanishCentral.com »

Woman With Cell Phone

Our Dictionary,
On Your Devices

Merriam-Webster,
With Voice Search
Get the Free Apps! »

Merriam-Webster's
Visual Dictionaries

Visual Dictionary Book Cover

The new edition of the
remarkable reference
features 8,000
illustrations.
Learn More »

Join Us

Learner's Dictionary
on Twitter »

Learner's Dictionary
on Facebook »

Bookstore: Digital and Print

Merriam-Webster references for Mobile, Kindle, print, and more. See all »

Other Merriam-Webster Dictionaries

Webster's Unabridged Dictionary » Britannica English - Arabic Translation » Nglish - Spanish-English Translation »

Spanish Central » Visual Dictionary » WordCentral for Kids »

Browse the Learner's Dictionary

© 2017 Merriam-Webster, Incorporated