masto-

a combining form meaning “breast,” used in the formation of compound words:

mastopathy.

Also, especially before a vowel, mast-.

Origin

combining form representing Greek mastós breast

British Dictionary definitions for masto-

masto-

combining form

indicating the breast, mammary glands, or something resembling a breast or nipple: mastodon, mastoid

Word Origin

from Greek mastos breast

Word Origin and History for masto-

before vowels mast-, word-forming element meaning "breast," from comb. form of Greek mastos "woman's breast," from madan "to be wet, to flow," from PIE *mad- "wet, moist, dripping" (cf. Latin madere "be moist;" Albanian mend "suckle;" see mast (n.2)).

masto- in Medicine

masto- or mast-
pref.
Breast; mammary gland; nipple: mastectomy.