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

• genus Saussurea
• genus Saxegothea
• genus Saxicola
• genus Saxifraga
• genus Sayornis
• genus Scabiosa
• genus Scaphiopus
• genus Scaphosepalum
• genus Scarabaeus
• genus Scardinius
• genus Scartella
• genus Sceliphron
• genus Sceloglaux
• genus Sceloporus
• genus Schaffneria
• genus Schefflera
• genus Schinus
• genus Schistosoma
• genus Schizachyrium
• genus Schizaea
• genus Schizanthus
• genus Schizopetalon
• genus Schizophragma
• genus Schizosaccharomyces
• genus Schlumbergera