[oh-pee-oid] /ˈoʊ piˌɔɪd/
noun, Biochemistry, Pharmacology.
any opiumlike substance.
any of a group of natural substances, as the endorphins, produced by the body in increased amounts in response to stress and pain.
any of several synthetic compounds, as methadone, having effects similar to natural alkaloids and their derivatives.
pertaining to such a substance.
1957, from opium + -oid.
opioid o·pi·oid (ō’pē-oid’)
See opiate. adj.
opiomelanocortin o·pi·o·mel·a·no·cor·tin (ō’pē-ō-měl’ə-nō-kôr’tn) n. A linear polypeptide of the pituitary gland that contains the nucleotide sequences of endorphins and various pituitary hormones.
opisthenar o·pis·the·nar (ə-pĭs’thə-när’) n. The back of the hand.
opisthion o·pis·thi·on (ə-pĭs’thē-ŏn’) n. The middle point on the rear margin of the great foramen.
1. a combining form meaning “back,” “behind,” “rear,” used in the formation of compound words: opisthograph. opistho- pref. Back; backward: opisthotonos.