Definitions
from The Century Dictionary.
- Protuberant, like a knob, boss, or umbo; umbonic; umbonate: as, an umbonal formation.
- in conchology, a part of each valve of a bivalve toward the umbo and within the pallial line; that part of the shell which is delimited by the mantle-margin.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective Relating to the
umbo .
Etymologies
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Examples
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[VENUS CRIBRARI] Shell thick, medium size, slightly ventricose, furnished upon the outside by about twenty-five sharp lamelliform concentric and recurved ribs, crenulated upon the umbonal side; ribbed or ridged transversely on the ventral side, the ridges extending across to the adjacent rib; lunule crenulated.
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