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Byssus

Definition: A cloth of exceedingly fine texture, used by the ancients.
It is disputed whether it was of cotton, linen, or silk.

Byssus

Definition: A tuft of long, tough filaments which are formed in a
groove of the foot, and issue from between the valves of certain
bivalve mollusks, as the Pinna and Mytilus, by which they attach
themselves to rocks, etc.

Byssus

Definition: An obsolete name for certain fungi composed of slender
threads.

Byssus

Definition: Asbestus.