diapsidadj.n.

/dʌɪˈapsɪd/

Etymology: < modern Latin Diapsida (H. F. Osborn 1903, in Mem. Amer. Mus. Nat. Hist. I. 455), < di- comb. form + Greek ἁψίς, ἁψιδ- arch.

Of a reptile skull: having two pairs of temporal arches, as in reptiles once grouped in the subclass Diapsida. Also as n.

ΚΠ

1933 A. S. Romer Vertebr. Paleontol. vi. 128 It was once thought that all reptiles originally had two temporal openings, and hence forms with two openings (or two bars across the temple, which amounts to the same thing) were termed ‘diapsid’ (two-arched).

1956 A. S. Romer Osteol. Reptiles ii. 473 It is very possible that all diapsids and diapsid derivatives have sprung from a common ancestor.

1969 A. Bellairs Life of Reptiles I. ii. 24 In many reptiles there are in fact two such openings in the skull on each side, one above the other, and hence an upper and a lower arch. This condition is known as diapsid.

Derivatives

diˈapsidan adj.

ΚΠ

1903 Mem. Amer. Mus. Nat. Hist. I. 460 In all the Diapsidan types without exception the supratemporal fenestra is relatively small.

This entry has not yet been fully updated (first published 1933; most recently modified version published online June 2019).

单词	diapsid
释义	diapsidadj.n. /dʌɪˈapsɪd/ Etymology: < modern Latin Diapsida (H. F. Osborn 1903, in Mem. Amer. Mus. Nat. Hist. I. 455), < di- comb. form + Greek ἁψίς, ἁψιδ- arch. Of a reptile skull: having two pairs of temporal arches, as in reptiles once grouped in the subclass Diapsida. Also as n. ΚΠ 1933 A. S. Romer Vertebr. Paleontol. vi. 128 It was once thought that all reptiles originally had two temporal openings, and hence forms with two openings (or two bars across the temple, which amounts to the same thing) were termed ‘diapsid’ (two-arched). 1956 A. S. Romer Osteol. Reptiles ii. 473 It is very possible that all diapsids and diapsid derivatives have sprung from a common ancestor. 1969 A. Bellairs Life of Reptiles I. ii. 24 In many reptiles there are in fact two such openings in the skull on each side, one above the other, and hence an upper and a lower arch. This condition is known as diapsid. Derivatives diˈapsidan adj. ΚΠ 1903 Mem. Amer. Mus. Nat. Hist. I. 460 In all the Diapsidan types without exception the supratemporal fenestra is relatively small. This entry has not yet been fully updated (first published 1933; most recently modified version published online June 2019). < adj.n.1903
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