Pterna, ter′na, n. the heel-pad in birds:—pl. Pter′næ.
Pterodactyl, ter-ō-dak′til, n. an extinct flying reptile with large and bird-like skull, long jaws, and a flying-membrane like that of a bat. [Gr. pteron, wing, daktylos, finger.]
Pterography, ter-og′ra-fi, n. the description of feathers.—n. Pterog′rapher.—adjs. Pterograph′ic, -al; Pterolog′ical.—n. Pterol′ogy, the science of insects' wings.
Pteromys, ter′ō-mis, n. a genus of Sciuridæ, the flying-squirrels.
Pteron, tē′ron, n. a range of columns, portico.—n. Pterō′ma, a peridrome: a side-wall. [Gr.]
Pterope, ter′ōp, n. a fruit-bat or flying-fox.
Pteropod, ter′ō-pod, n. one of a class of molluscs which move about by means of wing-like appendages attached to the sides of the head, which are not, however, homologous to the foot of other molluscs:—pl. Pterop′oda. [Gr. pteron, wing, pous, podos, foot.]
Pterosauria, ter-ō-saw′ri-a, n.pl. a group of extinct flying reptiles. [Gr. pteron, wing, sauros, lizard.]
Pterygoid, ter′i-goid, n. one of a pair of bones in the facial apparatus of some vertebrata behind the palatines, known in human anatomy as the pterygoid plates of the sphenoid bone.—adj. aliform or alate.—adj. Pteryg′ian.—n. Pteryg′ium, a generalised limb of a vertebrate.
Pterylæ, ter′i-lē, n.pl. the bands of contour feathers in birds.—adjs. Pterylograph′ic, -al.—adv. Pterylograph′ically.—n. Pterylog′raphy.