n. a class of eel-shaped chordates with a cartilaginous skeleton lacking jaws, scales, and pelvic fins. Among these are the lampreys and hagfishes. There are some extinct forms. Syn. -- class Agnatha. [ WordNet 1.5 ]
n. 1. an eel-shaped vertebrate without jaws or paired appendages; a member of the Agnatha. The group includes the cyclostomes and some extinct forms. Syn. -- jawless vertebrate, jawless fish [ WordNet 1.5 ]
‖ n. pl. [ NL., from Gr. &unr_; hair + &unr_; jaw. ] (Zool) a phylum consisting of the arrowworms, a group of small active transparent free-swimming marine worms, of which the genus Sagitta is the type. They have groups of curved spines on each side of the head. Syn. -- phylum Chaetognatha. [ 1913 Webster + WordNet 1.5 ]
‖n. pl. [ NL., fr. Gr. &unr_; lip + gna`qos Jaw. ] (Zool.) One of the two principal orders of myriapods. They have numerous segments, each bearing two pairs of small, slender legs, which are attached ventrally, near together. [ 1913 Webster ]
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