1Either of two aquatic plants with a spikelike inflorescence: (in early use) wild calla or bog arum, Calla palustris (family Araceae) (now rare); (now, chiefly North American) lizard's tail, Saururus cernuus (family Saururaceae).

2A mythical water monster.

3Any of several Australasian and Asian lizards occurring in the vicinity of water; especially the semiaquatic Physignathus lesueurii (family Agamidae) of eastern Australia.