Definition of pen shell in English:

pen shell

Syllabification: pen shell

noun

  • A large, wedge-shaped, bivalve mollusk of warm seas that burrows into the seabed where it attaches itself by strong byssus threads.
    • Family Pinnidae: Pinna and other genera
    More example sentences
    • Included are pen shells, pearl oysters and a young Tridacna.
    • Modern pinnoideans, or ‘pen shells,’ are shallowly to deeply endobyssate, equivalved, edentulous, ham-shaped bivalves with a single, slightly submerged, opisthodetic ligament.
    • Perfect for photography, the cave walls and rocky floor are filled with marine life, including pen shells and seahorses.

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a slit made by cutting with a saw