| 释义 |
metacone Zool.|ˈmɛtəkəʊn|
[f. meta- + cone n.1]
An external cusp on the outer back corner of a mammalian upper molar tooth. Hence metaˈconal a.
1888H. F. Osborn in Amer. Naturalist XXII. 1072 Proposed terms... Metacone. 1896Proc. Zool. Soc. 570 The dental germ presenting the appearance of a high cone with a large posterior heel (metaconal region) and a slight internal extension. Ibid., The posterior extension representing the metacone. 1933A. S. Romer Vertebr. Paleont. xii. 248 Inside the metacone [there is often] a smaller one [sc. cusp], the metaconule. 1971P. Hershkovitz in A. A. Dahlberg Dental Morphol. & Evolution viii. 103 In the first molar of Potamogale, the first indication of the metacone is a wedgelike indentation. Ibid. 129 In cercopithecoids, crista V is transverse and meets the buccal and metaconal portion of the plagiocrista. |