sub·aquat·ic /-əˈkwɑtɪk, ˈkwæ-/
 (a.)半水生的


 Sub·a·quat·ic Sub·a·que·ous a.
 1. Being under water, or beneath the surface of water; adapted for use under water; submarine; as, a subaqueous helmet.
 2. Geol. Formed in or under water; as, subaqueous deposits.

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 subaquatic
      adj 1: growing or remaining under water; "viewing subaqueous fauna
             from a glass-bottomed boat"; "submerged leaves" [syn:
             subaqueous, submerged, submersed, underwater]
      2: partially aquatic; living or growing partly on land and
         partly in water; "a marginal subaquatic flora" [syn: semiaquatic]