| 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] | |
| mast- or (before a vowel) mast- | |
| —combining form | |
| [from Greek mastos breast] | |
mast- pref.
Variant of masto-.