uni·valve /ˈjunɪˌvælv/
 (a.)單瓣的,單殼的單殼軟體動物


 U·ni·valve n.  Zool. A shell consisting of one valve only; a mollusk whose shell is composed of a single piece, as the snails and conchs.
 Note: ☞ Most univalves are spiral and are the shells of gastropods, but many belong to cephalopods and pteropods. A large number of univalves belonging to the gastropods are conical, cup-shaped, or shieldlike, as the limpets.

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 U·ni·valve U·ni·valved a.  Bot. & Zool. Having one valve; as, a univalve shell or pericarp.

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 univalve
      adj : used of mollusks, especially gastropods, as snails etc.
            [ant: bivalve]
      n : a class of mollusks typically having a one-piece coiled
          shell and flattened muscular foot with a head bearing
          stalked eyes [syn: gastropod]