emarginate

/ɪˈmɑrdʒɪˌneɪt/
adjective
  1. Having a notched or indented edge, especially in biology (e.g., leaves, fins, or shells).
    • Some shells have an emarginate opening, making them distinct from similar types.
    • The biologist noted that the fish had an emarginate tail fin, which helped identify the species.
    • The leaf of this plant is emarginate, with a small notch at the tip.
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