Acanthopterygii :: Acanthopterygii (n. pl.) An order of fishes having some of the rays of the dorsal, ventral, and anal fins unarticulated and spinelike, as the perch..
Acanthopterygious :: Acanthopterygious (a.) Having fins in which the rays are hard and spinelike; spiny-finned.
Apteryges :: Apteryges (n. pl.) An order of birds, including the genus Apteryx..
Apteryx :: Apteryx (n.) A genus of New Zealand birds about the size of a hen, with only short rudiments of wings, armed with a claw and without a tail; the kiwi. It is allied to the gigantic extinct moas of the same country. Five species are known..
Archaeopteryx :: Archaeopteryx (n.) A fossil bird, of the Jurassic period, remarkable for having a long tapering tail of many vertebrae with feathers along each side, and jaws armed with teeth, with other reptilian characteristics..
Archipterygium :: Archipterygium (n.) The primitive form of fin, like that of Ceratodus..
Basipterygium :: Basipterygium (n.) A bar of cartilage at the base of the embryonic fins of some fishes. It develops into the metapterygium.
Basipterygoid :: Basipterygoid (a. & n.) Applied to a protuberance of the base of the sphenoid bone.
Chondropterygii :: Chondropterygii (n. pl.) A group of fishes, characterized by cartilaginous fins and skeleton. It includes both ganoids (sturgeons, etc.) and selachians (sharks), but is now often restricted to the latter..
Crossopterygian :: Crossopterygian (a.) Of or pertaining to the Crossopterygii.
Malacopterygii :: Malacopterygii (n. pl.) An order of fishes in which the fin rays, except the anterior ray of the pectoral and dorsal fins, are closely jointed, and not spiny. It includes the carp, pike, salmon, shad, etc. Called also Malacopteri..
Mesopterygium :: Mesopterygium (n.) The middle one of the three principal basal cartilages in the fins of fishes.
Metapterygium :: Metapterygium (n.) The posterior of the three principal basal cartilages in the fins of fishes.
Odontopteryx :: Odontopteryx (n.) An extinct Eocene bird having the jaws strongly serrated, or dentated, but destitute of true teeth. It was found near London..