obrotund en · ADJ
Etymology
Borrowed from Latin obrotundus (“somewhat round”), from ob- (“towards; against”) + rotundus. Analyzeable as ob- + rotund.
Meanings
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(literary, not-comparable, rare) Nearly but not completely round; roundish.
It is a minute, perhaps juvenile shell, ten millimetres in length, obrotund, thin, not nacreous, equivalve, brown, hinge without teeth; foot rudimentary; fixed to rocks by a byssus.
1882, George W[ashington] Tryon Jr., Structural and Systematic Conchology: An Introduction to the Study of the Mollusca, volume I, page 268: