Definition of crenulate in English:

crenulate

Pronunciation /ˈkrenyəlit/ /-yəˌlāt/ /ˈkrɛnjələt/

adjective

technical
  • (especially of a leaf, shell, or shoreline) having a finely scalloped or notched outline or edge.

    ‘Growth lines are very finely crenulate in a narrow zone approximately two-thirds the distance from the umbilicus to the periphery, and the shell here has a very weak shoulder.’
    Compare with crenate
    • ‘The maximum width of this specimen occurs at the mid-length, and the anterolateral margin is crenulate.’
    jagged, craggy, rugged, uneven, rough, irregular, broken

Origin

Late 18th century from modern Latin crenulatus, from crenula, diminutive of crena ‘notch’.