Medical Definition of longus
plural lon·gi \-gī\play
: a long structure (as a muscle) in the body—see abductor pollicis longus, adductor longus, extensor carpi radialis longus, extensor digitorum longus, extensor hallucis longus, extensor pollicis longus, flexor digitorum longus, flexor hallucis longus, flexor pollicis longus, palmaris longus, peroneus longus
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