Phantasm: something imagined; an illusion, or apparition; something that seems to exist, but, in fact, does not. The Latin word for ghost is phantasma. It comes from the Greek φάντασμα (a phantasm), which derives from φαντάζω (I make visible). The English word ghost...
Acantha: In botany, a prickle; in zoology, a spine or prickly fin. Acantha, in Greek mythology, was a beautiful nymph. Apollo fell in love with her. She resisted his advances. While pushing him away, she scratched his face. In anger, he turned her into a prickly...
