PLANULA Meaning of PLANULA in English [ 'planjʊlə ]■ noun ( plural ~e -li: ) Zoology a free-swimming coelenterate larva with a flattened, ciliated solid body.OriginC19: mod. L., dimin. of L. planus 'plane, flat'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004