BYSSUS Meaning of BYSSUS in English n. hist. (pl. byssuses or byssi) 1. hist. a fine textile fibre and fabric of flax. 2 a tuft of tough silky filaments by which some molluscs adhere to rocks etc. Etymology: ME f. L f. Gk bussos Oxford English vocab. Оксфордский английский словарь. 2012