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Synonyms for Semiaquatic (same or very similar meaning)

WordNet sense 1 (having an aquatic early or larval form and a terrestrial adult form):
amphibiotic

WordNet sense 2 (operating or living on land and in water):
amphibious

WordNet sense 3 (partially aquatic; living or growing partly on land and partly in water):
subaquatic

WordNet sense 4 (operating or living or growing in water):
aquatic


From the ODE community, based on WordNetadd/edit