unicorn

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/ˈjuːnɪkɔːn/ English

Definitions

A mythical beast resembling a horse or deer with a single, straight, spiraled horn projecting from its forehead.
In various Bible translations, used to render the Latin unicornis or rhinoceros (representing Hebrew רְאֵם): a reem or wild ox.
Any large beetle having a horn-like prominence on the head or prothorax, especially the Hercules beetle, Dynastes tityus.
A caterpillar, Schizura unicornis, with a large thorn-like spine on the back near its head.

(sexual slang) To participate in a sexual threesome as a bisexual addition to an established heterosexual couple.
To exceed a valuation of one billion U.S. dollars, while solely backed by venture capitalists.