univalve

/yoo-nuh-valv/US // ˈyu nəˌvælv //UK // (ˈjuːnɪˌvælv) zoology //

骑士,骑士精神,骑士团,骑士勋章

Definitions

adj.形容词 adjective

1
Also u·ni·valved, u·ni·val·vu·lar [yoo-nuh-val-vyuh-ler]. /ˌyu nəˈvæl vyə lər/.
- : having one valve.
- : composed of a single valve or piece.

n.名词 noun

Some of these are most vivid in their shapes and ray-like markings, particularly the univalve shells.
E is Spirorbis, a minute form with a coiled tube, which looks at first sight like a small univalve shell.
The snail proper bears a typical univalve shell: though in its relatives (the slugs), the shell is more or less suppressed.
The lid is not, however, like the tongue-ribbon, an essential feature of the structure of every univalve mollusc.
The anterior of a spiral univalve is that part of the outer lip which is at the greatest distance from the apex.