One of the mysteries of the English language finally explained.
Of a bird: having a syrinx whose muscles are attached to the ends of the bronchial semi-rings; specifically (in Garrod's scheme) belonging to the division Acromyodi of passerine birds, closely corresponding to the suborder Oscines (the songbirds).
Late 19th century. From scientific Latin Acromyodi, former group name from acro- + -myodi + -an.
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