MASTOID
mastoid, mastoidal
(adjective) relating to or resembling a nipple
mastoid
(adjective) of or relating to or in the region of the mastoid process
mastoid, mastoid process, mastoid bone, mastoidal
(noun) process of the temporal bone behind the ear at the base of the skull
Source: WordNet® 3.1
Etymology 1
Adjective
mastoid (not comparable)
(anatomy) Of or relating to the mastoid process of the temporal bone.
Noun
mastoid (plural mastoids)
(anatomy) The mastoid process.
Etymology 2
Adjective
mastoid (not comparable)
Shaped like a breast or nipple.
Anagrams
• diatoms
Source: Wiktionary
Mas"toid, a. Etym: [Gr. mastoïde.] (Anat.)
(a) Resembling the nipple or the breast; -- applied specifically to a
process of the temporal bone behind the ear.
(b) Pertaining to, or in the region of, the mastoid process;
mastoidal.
Source: Webster’s Unabridged Dictionary 1913 Edition