(n)used in some classification systems; a suborder or superfamily nearly coextensive with suborder Tyranni; Passeriformes having relatively simple vocal organs and little power of song; clamatorial birds, Syn.suborder Clamatores
The Collaborative International Dictionary of English (GCIDE) v.0.53Collaborative International Dictionary (GCIDE)
‖n. pl. [ L. clamator, pl. clamatores, a bawler. ] (Zool.) A division of passerine birds in which the vocal muscles are but little developed, so that they lack the power of singing. [ 1913 Webster ]