masto-

American  

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

   mastopathy.

---

masto- British  

combining form

1. indicating the breast, mammary glands, or something resembling a breast or nipple

   mastodon

   mastoid

---

Usage

What does masto- mean? Masto- is a combining form used like a prefix meaning “breast.” It is often used in medical terms, especially in anatomy and pathology. Masto- comes from the Greek mastós, meaning “breast.” The Latin-based analog to masto- is mammo-, from mamma, meaning “breast.”What are variants of masto-?When combined with words or word elements that begin with a vowel, masto- becomes mast-, as in mastectomy.

Etymology

Origin of masto-

Combining form representing Greek mastós breast