my

[ mahy ]
/ maɪ /

pronoun

(a form of the possessive case of I used as an attributive adjective): My soup is cold.

interjection

Also my-my. (used as an exclamation of mild surprise or dismay): My, what a big house this is! My-my, how old he looks!

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Origin of my

1125–75; Middle English mī, variant of mīn,Old English mīn;see mine1

grammar notes for my

See me.

Definition for my (2 of 2)

my-

variant of myo- before some vowels: myalgia.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

WORDS THAT USE MY-

What does my- mean?

My- is a combining form used like a prefix meaning “muscle.” It is often used in medical terms, especially in anatomy.

My- comes from the Greek mŷs, meaning “muscle” and “mouse.” Mouse? You read that right. Discover why at our entry for muscle!

My- is a variant of myo-, which loses its -o- when combined with words or word elements beginning with vowels. Want to know more? Read our Words That Use myo article.

Examples of my-

An example of a word you may have seen that features my- is myatonia, meaning “deficient muscle tone.”

We know my- means “muscle.” What about –atonia? It’s based on atonia (also atony), “lack of tone or energy.” Myatonia, then, literally translates to “lack of muscle tone or energy.” Learn more about atonia at our entry for the word.

What are some words that use the combining form my-?

What are some other forms that my- may be commonly confused with?

Not every word that begins with the exact letters my- is necessarily using the combining form my- to denote “muscle,” e.g., myopic or myriad.

Break it down!

The noun asthenia means “lack or loss of strength; weakness.” With that in mind, what would a patient with myasthenia be experiencing?

British Dictionary definitions for my (1 of 4)

my1
/ (maɪ) /

determiner

of, belonging to, or associated with the speaker or writer (me)my own ideas; do you mind my smoking?
used in various forms of addressmy lord; my dear boy
used in various exclamationsmy goodness!

interjection

an exclamation of surprise, awe, etcmy, how you've grown!

Word Origin for my

C12 mī, variant of Old English mīn when preceding a word beginning with a consonant

British Dictionary definitions for my (2 of 4)

my2

the internet domain name for

Malaysia

British Dictionary definitions for my (3 of 4)

MY

abbreviation for

motor yacht

British Dictionary definitions for my (4 of 4)

my-

combining form

a variant of myo-
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for my (1 of 2)

My

abbr.

myopia

Medical definitions for my (2 of 2)

my-

pref.

Variant ofmyo-
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.