adjective Botany, Zoology.
Examples from the Web for semiaquatic
The semiaquatic mammal is sometimes hunted for its meat and hide.
Turtles of the genus Terrapene belong to the Emyidae, a family comprising chiefly aquatic and semiaquatic species.
The majority are terrestrial, but some species are semiaquatic.Zoology: The Science of Animal Life|Ernest Ingersoll
The semiaquatic Otter, and the still more thoroughly aquatic (marine) Enhydris, suggest an affinity in that direction.The Cambridge Natural History, Vol X., Mammalia|Frank Evers Beddard