apsid

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• apside — [ apsid ] n. f. • 1691; « abside » XVIe; lat. imp. absida, lat. class. apsis; du gr. apsis, idos « voûte » ♦ Astron. Ligne des apsides : grand axe de l orbite elliptique d une planète. Apside inférieure (⇒ périastre, périhélie) , supérieure (⇒… …   Encyclopédie Universelle

• abside — [ apsid ] n. f. • 1562; bas lat. absida, gr. hapsis « voûte » ♦ Partie arrondie en hémicycle de certaines églises, derrière le chœur (⇒ chevet). ⊗ HOM. Apside. ● abside nom féminin (bas latin absida, du grec hapsis, idos, cercle, voûte) Espace de …   Encyclopédie Universelle

• apsis — noun (plural apsides) Etymology: New Latin apsid , apsis, from Latin, arch, orbit, from Greek hapsid , hapsis, from haptein to fasten Date: 1658 1. the point in an astronomical orbit at which the distance of the body from the center of attraction …   New Collegiate Dictionary

• synapsid — noun Etymology: New Latin Synapsida, from Greek syn + apsid , apsis arch, vault more at apsis Date: 1956 any of a subclass (Synapsida) of extinct chiefly Permian and Triassic reptiles (as the pelycosaurs) that resembled mammals, had a single pair …   New Collegiate Dictionary

• therapsid — noun Etymology: New Latin Therapsida, from ther mammal (from Greek thēr wild animal) + apsid , apsis arch, vault more at fierce, apsis Date: 1912 any of an order (Therapsida) of Permian and Triassic syrapsid reptiles considered ancestors of the… …   New Collegiate Dictionary

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• therapsid — /theuh rap sid/, n. 1. any of various groups of mammallike reptiles of the extinct order Therapsida, inhabiting all continents from mid Permian to late Triassic times, some of which were probably warm blooded and directly ancestral to mammals.… …   Universalium

• therapsid — the•rap•sid [[t]θəˈræp sɪd[/t]] n. pal any of various mammallike reptiles of the extinct order Therapsida, inhabiting all continents from mid Permian to late Triassic times • Etymology: < NL Therapsida (1905) = Gk thēr , s. of thḗr wild beast… …   From formal English to slang

• diapsid — /daɪˈæpsəd/ (say duy apsuhd) adjective 1. of or relating to a group of reptiles which developed during the late Carboniferous period, characterised by having a hole on each side of the skull; living members of the group are crocodiles, lizards,… …  

• Anapsida — noun oldest known reptiles; turtles and extinct Permian forms • Syn: ↑subclass Anapsida • Hypernyms: ↑class • Member Holonyms: ↑Reptilia, ↑class Reptilia • Member Meronyms …   Useful english dictionary