masto-


Also found in: Medical.

masto-

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

[From Greek mastos, breast.]

masto-

or before a vowel

mast-

combining form
indicating the breast, mammary glands, or something resembling a breast or nipple: mastodon; mastoid.
[from Greek mastos breast]