- (botany) A plant Astragalus hornii growing in the Southwestern United States, which is said to poison horses and cattle, first making them insane. The name is also given vaguely to several other species of the genus Astragalus.
- (colloquial) crazy
- (music) A direction in written or printed music to return to the proper pitch after having played an octave higher or lower.
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Full Definition of loco