Etymology
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mastoid (adj.)

"breast-shaped, teat-like, resembling a (female) breast or nipple," 1732, from Greek mastoeides "resembling a breast," from mastos "(woman's) breast" (see masto-) + -oeides "like," from eidos "form, shape" (see -oid). As a noun, 1800, from the adjective.

updated on December 02, 2018

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Definitions of mastoid from WordNet
1
mastoid (adj.)
of or relating to or in the region of the mastoid process;
mastoid (adj.)
relating to or resembling a nipple;
Synonyms: mastoidal
2
mastoid (n.)
process of the temporal bone behind the ear at the base of the skull;
Synonyms: mastoid process / mastoid bone / mastoidal
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.