- umbonal depression
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(MOLLUSCA: Bivalvia)A depression at the umbo tip.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.
umbonal depression
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pre — pre·abdomen; pre·acanthella; pre·adamitism; pre·adapt; pre·adaptation; pre·adaptive; pre·admission; pre·adolescence; pre·adult; pre·agonal; pre·am·bu·lar; pre·am·bu·late; pre·amp; pre·amplifier; pre·animism; pre·apprehension; pre·arrange;… … English syllables
