Learn how to say Byssus correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word byssus:
noun (plural byssuses or byssi /-sʌɪ/)
1 [mass noun] historical a fine textile fibre and fabric of flax.
2 Zoology a tuft of tough silky filaments by which mussels and some other bivalves adhere to rocks and other objects.
late Middle English: from Latin, from Greek bussos, of Semitic origin