Definition of Plectognathi
: an order of bony fishes that generally have the maxillary bone united with the premaxillary, the posttemporal united with the skull, and the gill openings greatly reduced in size, have the ventral fins rudimentary or wanting and the body usually covered with bony plates, spines, or small rough ossicles, and include the boxfishes, filefishes, puffer fishes, sunfishes, triggerfishes, and related forms
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Origin and Etymology of plectognathi
New Latin, from plect- + -gnathi, plural of -gnathus
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