usnea

noun us·nea \ ˈəs-nē-ə , ˈəz- \

Definition of usnea

: any of a genus (Usnea of the family Usneaceae) of widely distributed lichens (such as old-man's beard) that have a grayish or yellow pendulous freely branched thallus

Origin and Etymology of usnea

New Latin, from Arabic ushna moss


Medical Dictionary

Usnea

noun Us·nea \ ˈəs-nē-ə \

medical Definition of Usnea

: a genus of widely distributed lichens (family Usneaceae) including old-man's beard from which usnic acid is obtained

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