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.

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sternocleidomastoid (adj.)
medical Latin, from sterno- "sternum," Greek sternon "breast, breastbone," or Latin sternum (see sternum) + Latinized Greek kleis (see clavicle) + mastoid.
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