byssus

American  

[bis-uhs] / ˈbɪs əs /

noun

plural

byssuses, byssi

1. Zoology. a collection of silky filaments by which certain mollusks attach themselves to rocks.

2. an ancient cloth, thought to be of linen, cotton, or silk.

---

byssus British  

/ ˈbɪsəs /

noun

1. a mass of strong threads secreted by a sea mussel or similar mollusc that attaches the animal to a hard fixed surface

---

Other Word Forms

• byssaceous adjective
• byssal adjective
• byssoid adjective

Etymology

Origin of byssus

1350–1400; Middle English < Latin < Greek býssos a fine cotton or linen < Semitic; compare Hebrew būts

Example Sentences

Another key outcome of the research is the transformation of pen shell byssus, which was previously discarded as waste, into a valuable textile.

From Science Daily • Feb. 9, 2026

"Dreissenid byssus fibers, which resemble spider silk structurally, could inspire future development of tough polymer fibers, contributing to more durable and sustainable materials typically used in textiles and technical plastics."

From Science Daily • Dec. 8, 2023

"Up to this point, it was baffling how the byssus stem root biointerface could be strong enough to resist constant crashing waves but also be suddenly released by the mussel upon demand," said Harrington.

From Science Daily • Dec. 1, 2023

Then comes the slightly tedious task, which is pulling off the byssus, or beard, a small length of what looks like black threads twisted together.

From Washington Post • Oct. 29, 2020

He sat bare-headed beneath a parasol of byssus which was carried by a Negro behind him.

From Salammbo by Flaubert, Gustave