| 释义 |
protoconid Zool.|-ˈkəʊnɪd|
[f. prec. + -id5.]
A cusp on a mammalian lower molar tooth corresponding to the protocone on an upper molar.
1888[see prec.]. 1896Proc. Zool. Soc. 568 In the lower molar [of Gymnura] the protoconid evidently develops fast. 1907[see deuteroconid s.v. deutero-]. 1933[see metaconid]. 1971W. D. Turnbull in A. A. Dahlberg Dental Morphol. & Evolution ix. 168 (caption) The eocristid and its associated primary cusp, the protoconid or eoconid..are shown. 1976Nature 5 Aug. 464/2 There is a spatially dominant protoconid with a large flat buccal face, a lingually facing anterior fovea, and an inferiorly projecting mesiobuccal enamel line. |