adjective see umbo

New Collegiate Dictionary. 2001.

Look at other dictionaries:

  • umbonal — /um beuh nl/, adj. 1. having the shape or appearance of an umbo; bosslike: an umbonal structure. 2. of, pertaining to, or near the umbo: the umbonal region. Also, umbonic /um bon ik/. [1850 55; < L umbon (s. of umbo; see UMBO) + AL1] * * * …   Universalium

  • 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 — 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 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 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

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