From ZooTerms (Dictionary of Invertebrate Zoology)
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byssus (noun; plural byssi, byssuses; Latin byssos, fine flax): 1. (Mollusca: Bivalvia) Fibers or small bundles of silky threads by which they anchor themselves to the substratum; beard.

2. (NEMATA: Adenophorea) A series of elaborately branched projections at the poles of mermithid eggs, by which they attach to plants.