from the GNU version of the Collaborative International Dictionary of English
- n. A lamellibranch which has three muscular scars on each valve.
from The Century Dictionary and Cyclopedia
- Having three muscular impressions or ciboria on the inner surface of the shell, as a bivalve mollusk: correlated with monomyarian, dimyarian, etc.
- n. A trimyarian bivalve.
Sorry, no etymologies found.