Definition of "byssal" []

• Of or pertaining to the byssi, filaments secreted by certain bivalves (adjective)

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• "The most distinguishing characteristic is a tuft of fibers called byssal threads that grow from the foot and through the hinge of the mussel."
• "Mussels come with blue-black shells and brown hairs called byssal threads attached to their shell."
• "Mussels are covered with blue-black shells and brown hairs called byssal which are attached to their shell."