gynecomastia

noun

gy·​neco·​mas·​tia ˌgī-nə-kō-ˈma-stē-ə 

: excessive development of the breast in the male

Examples of gynecomastia in a Sentence

Recent Examples on the Web

Focus on the abdomen first, then gynecomastia reduction and sometimes a body lift at the same time, and finally the extremities like arms and thighs. — The Editors, Robb Report, 19 July 2026

The teen had gynecomastia, the often temporary enlargement of breast tissue in males during puberty. — Phoebe Quinton, AJC.com, 15 June 2026

At the medical center, a physician dismissed the symptoms as a reaction to the steroid medication she had been prescribed, misdiagnosing her with gynecomastia, a condition typically seen in men who use anabolic steroids, Sutherland’s lawyers said in a report. — Vanessa Etienne, PEOPLE, 3 Nov. 2025

In older men, as testosterone naturally declines, gynecomastia becomes more common, often combined with weight gain or medications that alter hormone levels. — Dr. Jamin Brahmbhatt, CNN Money, 26 Oct. 2025

Word History

Etymology

gyneco- + Greek mastós "breast" + -ia entry 1, probably after French gynécomastie or German Gynaecomastie or Gynecomastie — more at mastoid entry 1

First Known Use

1881, in the meaning defined above

Medical Definition

gynecomastia

noun

gy·​ne·​co·​mas·​tia

variants or chiefly British gynaecomastia

ˈgī-nə-kō-ˈmas-tē-ə  ˈjin-ə- 

: excessive development of the breast in the male