| 单词 |
trituberculate |
| 释义 |
trituberculate, a. Comp. Anat.|traɪtjuːˈbɜːkjʊlət|
[f. tri- + L. tūbercul-um tubercle + -ate2.]
Having three tubercles, as a tooth; relating to or characterized by such teeth. Also trituˈbercular a. So trituˈberculism, trituˈberculy, the condition of being tritubercular, or the presence of tritubercular teeth; trituˈberculist, one who holds that the molar teeth of mammals are modifications of tritubercular teeth.
1883Cope in Proc. Amer. Philos. Soc. (1884) 324 The type of superior molar tooth..was triangular or *tritubercular. 1890Nature 20 Mar. 466/2 The tritubercular molar consists of three cusps, cones, or tubercles, arranged in a triangle, and so disposed that those of the upper jaw alternate with those of the lower.
1835–6Todd's Cycl. Anat. I. 563/1 Molars..with *tri-tuberculate transverse ridges. 1902Sat. Rev. 6 Dec. 711/2 The..fossil Theromorpha with multituberculate teeth,..those with trituberculate teeth.
1890Nature 20 Mar. 466/2 It appears probable..that ‘*trituberculism’, as this type of tooth-structure may be conveniently termed, was developed from a simple cone-like tooth during the Mesozoic period. 1891Flower & Lydekker Mammals ii. 32 We also find trituberculism differentiating into a secodont and a bunodont series.
1896Proc. Zool. Soc. 5 May 590 There is no evidence to show that this type of upper molar arose in the way suggested by *trituberculists.
1888H. F. Osborn in Amer. Nat. 1068 The almost universal predominance of *trituberculy in the early geological periods. 1902Sat. Rev. 6 Dec. 711/2 Mr. Beddard..gives..the rival theories of trituberculy and multituberculy. |
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