Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. Abnormal enlargement of the breasts in a male.
Wiktionary
WordNet 3.0
- n. excessive development of the breasts in males; usually the result of hormonal imbalance or treatment with certain drugs (including some antihypertensives)
Examples
“For example, nearly 75% of the 18,000 men who underwent a procedure known as gynecomastia—male breast reduction—were between the ages of 13 and 19.”
The Wall Street Journal: Gym, Check. Diet, Check. Face, Lift
“Enlarged breasts in men, known as gynecomastia, generally indicates an imbalance of estrogen and testosterone, which can occur from puberty or aging -- or it could be a sign of kidney disease, or a pituitary tumor.”
“That is technically called gynecomastia, that men develop the breasts get enlarged.”
“Holler had a condition called gynecomastia, which causes male breast tissue to swell and take on a female shape.”
“The condition, known as gynecomastia, can affect men at any age and is usually caused by overeating or hormonal imbalances.”
“This suggested certain inherited syndromes, including gynecomastia, which is the excessive development of breasts in men, usually the result of a hormonal imbalance.”
“Liposuction may sometimes be used to treat a condition called gynecomastia, or male breast enlargement, which frequently occurs among both teenage and adult males.”
“It's a condition called gynecomastia, and it's typically a source of intense embarrassment for men.”
“This procedure is typically performed to treat a condition known as gynecomastia (enlarged breast tissue in men) or breasts enlarged as a result of fatty deposits from obesity.”
“For the second year, male breast reduction surgery - known as gynecomastia - is the fastest growing plastic surgery in England, the”
Lists
These user-created lists contain the word ‘gynecomastia’.
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Words for everyday things
tittle, lunule, crepuscular ray, ferrule, gynecomastia, muntin, akimbo, skeuomorph, paresthesia, obdormition, phosphene, armscye and 9 more...
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Kathy C's List
My favorite words
golconda, au fait, purlicue, tautonym, cunctatory, gynecomastia, vesta, imprimatur, efflux, antediluvian, protean, phlegmatic and 24 more...

Wordplayer Technically, it is the enlargement of the mammary gland, and it is common in teenage males, myself included. Mar 17, 2011
john Boobs know this as manboobs. Jun 10, 2009
sonofgroucho The Brits know this as gynaecomastia. Nov 9, 2007