(linguistics, phonetics) A consonant articulated by the lips. / (music) An organ pipe having a lip that influences its sound. / (zootomy) Any of the scales bordering the mouth opening of a reptile.

(chiefly Australia, UK, informal) Ill-tempered or annoyed.

simple past tense and past participle of RT

(entomology) A thread-like sensory organ found on nodes of the antennae of some midges in family Cecidomyiidae.