1. Growing or remaining under water
   - subaqueous, submerged, submersed, underwater 
2. Partially aquatic; living or growing partly on land and partly in water
   "a marginal subaquatic flora"
   - semiaquatic

See also: aquatic

• assault gun
• assault rifle
• assaulter
• assaultive
• assay
• assay-mark
• assayer
• asse
• assegai
• assemblage
• assemble
• assembler
• Assemblies of God
• assembling
• assembly
• assembly hall
• assembly language
• assembly line
• assembly plant
• assembly program
• assemblyman
• assemblywoman
• assent
• assentation
• assenter