umbonal
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umbonal — ˈəmbənəl, |əm|bōn adjective Etymology: Latin umbon , umbo + English al : of, relating to, or having the characteristics of an umbo long umbonal projections frequently contain hollow spaces between … calcareous layers K.H.Barnard … Useful english dictionary
umbonal angle — (MOLLUSCA: Bivalvia) In pectinoid shells, the angle of divergence of the umbonal folds; in other shells the divergence of the posterodorsal and anterodorsal parts of the longitudinal profile … Dictionary of invertebrate zoology
umbonal cavity — (MOLLUSCA: Bivalvia) 1. Part of the valve interior which lies within the umbo and under the hinge plate. 2. In oysters, that part of the left valve interior lying in the umbonal region beneath the ligamental area … Dictionary of invertebrate zoology
umbonal — adjective see umbo … New Collegiate Dictionary
umbonal — adj. having the form of a protuberance or protruding portion, like an umbo; of or pertaining to an umbo, near the umbo … English contemporary dictionary
umbonal — um·bo·nal … English syllables
umbonal depression — (MOLLUSCA: Bivalvia) A depression at the umbo tip … Dictionary of invertebrate zoology
umbonal fold — (MOLLUSCA: Bivalvia) In pectinoid shells, a ridge originating at the umbo and setting the auricle off from the shell body … Dictionary of invertebrate zoology
umbonal pole — (MOLLUSCA: Bivalvia) The point of maximum curvature of the longitudinal profile of the dorsal valve … Dictionary of invertebrate zoology
umbonal reflection — (MOLLUSCA: Bivalvia) The reflection of the dorsal margin of the valves anterior to and usually over the umbos … Dictionary of invertebrate zoology
