mastoid

mas·toid  (mstoid)

n.

The mastoid process.

adj.

1. Of or relating to the mastoid process.

2. Shaped like a breast or nipple.

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[New Latin mastods, nipple-like, mastoid (from its shape), from Greek mastoeids : mastos, breast + -oeids, -oid.]

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mastoid

Adjective

shaped like a nipple or breast

Noun

1. a nipple-like projection of bone behind the ear

2. Informal mastoiditis [Greek mastos breast]

Thesaurus

Noun	1.	mastoid - process of the temporal bone behind the ear at the base of the skull mastoid bone, mastoid process, mastoidal mastoidale - the craniometric point at the lowest point of the mastoid process os temporale, temporal bone - a thick bone forming the side of the human cranium and encasing the inner ear appendage, outgrowth, process - a natural prolongation or projection from a part of an organism either animal or plant; "a bony process"
Adj.	1.	mastoid - of or relating to or in the region of the mastoid process
	2.	mastoid - relating to or resembling a nipple mastoidal