Salmacis

Salmacis was an atypical nymph and naiad, rejecting the ways of the virginal Greek goddess Artemis, of hunt, in favor of vanity and idleness. Her attempted rape of Hermaphroditus places her as the only nymph rapist in the Greek mythological canon."There dwelt a Nymph, not up for hunting or archery: unfit for footraces. She the only Naiad not in Diana’s band. Often her sisters would say: “Pick up a javelin, or bristling quiver, and interrupt your leisure for the chase!” But she would not pick up a javelin or arrows, nor trade leisure for the chase. Instead she would bathe her beautiful limbs and tend to her hair, with her waters as a mirror."  Ovid ’’Metamorphoses’’ IV. 306-312
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Noun
1. nymph who merged with Hermaphroditus to form one body
(hypernym) nymph

[Greek] The nymph of the spring of that name near Halicarnassus in Asia Minor. She loved Hermaphroditus and was granted her request to be united with him, but the gods put the both of them in one body. Hence the dual sexuality of Hermaphroditus and the legend that the spring Salmacis rendered effeminate those who bathed or drank of its waters.