单词	cementum
释义	cementum noun ce·​men·​tum si-ˈmen-təm  : a specialized bony layer of connective tissue covering the dentin of the part of a tooth normally within the gum see tooth illustration Example Sentences Recent Examples on the Web An annulus, or dark ring, is formed each winter between the cementum formed in spring and summer growth periods. Alan Clemons, Outdoor Life, 18 Mar. 2021 From the moment a tooth emerges from the gum, cementum starts to form annual layers, similar to a tree's rings. Jack Guy, CNN, 25 Mar. 2020 The researchers are also working with high-resolution CT scans to develop a non-destructive method of studying cementum. Jack Guy, CNN, 25 Mar. 2020 In a similar vein, a substance called cementum protects your teeth’s roots, which contain the pulpy center that holds blood vessels and nerves. Korin Miller, SELF, 18 Apr. 2018 Instead, the tooth bases were caked in cementum, a bony material that affixed the teeth to the jaw, and Caldwell says that the teeth appeared to have been dislodged during fossilization. Michael Greshko, National Geographic, 2 Nov. 2016 Word History Etymology New Latin, from Latin caementum First Known Use 1842, in the meaning defined above Kids Definition cementum noun ce·​men·​tum si-ˈmen-təm  : a thin bony layer covering the part of a tooth inside the gum Medical Definition cementum noun ce·​men·​tum si-ˈment-əm  : a specialized external bony layer covering the dentin of the part of a tooth normally within the gum called also cement compare dentin, enamel
随便看	reversion reversion duty reversion to type reversionable reversional reversionaries reversionary reversionary annuity reversioner reversioners reversionist reversionists reversions reversis reversive reverso reversos revert revert to revert to type revertant revertants reverted reverted to reverted to form

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