pterygospinous (ter"i go spin us)

[NL. pterygospinosus, pterygostaphylinus (ter"i-gō-staf-i-li'nus), n.; pl. pterygostaphylini (-nī). [NL., pterygostium (ter-i-gos'ti-um), n.; pl. pterygos tia (-a). [Also pterygosteum; NL. (Leach, 1829), circulation of fluids and the entrance of tracheæ. pterylographic + -al.] Same as pterylographic. pterylographic ally (ter"i-lō-graf'i-kal-i), adv. With reference to pterylography; upon pterylographical principles. pterylography (ter-i-log'ra-fi), n. [NL. ptery la + Gr. -γραφία, the mode of feathering; the distribution of the feathers in tracts. It differs from ptilosis in that the latter relates to the character of the plumage itself, not to its disposition upon the body.