semiaquatic 1. Partially aquatic; living or growing partly on land and partly in water. 2. Having an aquatic early or larval form and a terrestrial adult form. 3. Adapted for living or growing in or near water; not entirely aquatic: 'They were looking for semiaquatic plants and animals.' Found on http://www.wordinfo.info/words/index/info/view_unit/1932/