A group of organisms, particularly sea creatures, that move freely and are not attached to a surface, as opposed to sedentary species.
From Greek eleutheros 'free' and zoon 'animal.' An older biological classification for mobile organisms.
Scientists called free-swimming sea creatures eleutherozoa to distinguish them from things like corals and sponges that are stuck in place forever—it's all about who gets to move.
Complete word intelligence in one call. Free tier — 50 lookups/day.