plural byssuses or byssi ˈbi-ˌsī How to pronounce byssus (audio)
-(ˌ)sē
1
: a fine probably linen cloth of ancient times
2
[New Latin, from Latin] : a tuft of long tough filaments by which some bivalve mollusks (such as mussels) adhere to a surface

Examples of byssus in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Eliminate the incrustations and the byssus, if present, wash them very well under running water. — Morgan Hines, USA TODAY, 23 Dec. 2022 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. — Washington Post, 29 Oct. 2020 The granules consist of iron and a protein called mfp-1, heavily linked to one other - this makes the byssus hard. — Ed Yong, Discover Magazine, 5 Mar. 2010

Word History

Etymology

Middle English bissus, from Latin byssus, from Greek byssos flax, of Semitic origin; akin to Hebrew būṣ linen cloth

First Known Use

14th century, in the meaning defined at sense 1

Time Traveler
The first known use of byssus was in the 14th century

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Cite this Entry

“Byssus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/byssus. Accessed 26 Sep. 2026.

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