costula
noun
cos·tu·la
ˈkäschələ,
-styə-
variants
or costule
-schəl,
-styəl
plural costulae
-ˌlē,
-ˌlī
or costules
zoology
: a small ridge (as one of those that make up the sculpture of a mollusk shell)
costulation
noun
ˌ⸗⸗ˈlāshən
plural -s
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Merriam-Webster unabridged
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