buttress n. [OF. bouterez, to thrust] 1. (ARTHRO: Insecta) In Culicidae pupae, a sclerotized, thickened basolateral part of the paddle; external buttress; external thickening; nervure. 2. (MOLL: Bivalvia) A radiating ridge on the interior that reinforces the hinge process.
byssaceous a. [Gr. byssos, fine flax] Composed of fine filaments.
byssal foramen (MOLL: Bivalvia) An opening in the right valve for passage of byssus in Anomiidae oysters.
byssal gape (MOLL: Bivalvia) An opening between the valve margins for the passage of the byssus.
byssal gland (MOLL: Bivalvia) A viscid secreting gland producing the byssal threads that anchors the organism to rocks and solid objects; also called byssal pit. see byssus.
byssal notch (MOLL: Bivalvia) A small opening or notch located on the ventral margin for the passage of the byssus from the byssal gland.
byssal sinus (MOLL: Bivalvia) Corresponds to the byssal notch of the right valve, but shallower and on the left valve in the Pectinacea.
byssus n.; pl. byssi, byssuses [L. byssos, fine flax] 1. (MOLL: 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.
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