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opioid

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(ō′pē o̵id′)

adjective

designating or of a group of natural or synthetic biochemicals, esp. endorphins, that relieve pain in the same way that opiates do

noun

any such biochemical

See opioid in American Heritage Dictionary 4

noun

adjective

Opiate.

Origin:

Origin: opi(um)

Origin: + -oid

.

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