One of the mysteries of the English language finally explained.
Of a bird: having a syrinx with several distinct muscles; specifically (in Müller's scheme) belonging to the division Polymyodi of passerine birds, nearly corresponding to the suborder Oscines (the songbirds).
Mid 19th century; earliest use found in Proceedings of the Zoological Society of London. From scientific Latin Polymyodi, former group name + -an.
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