PHANTASOS [noun] Greek mythology: one of the Oneiroi. He appeared in dreams in the form of inanimate objects. He is the son of Hypnos, the God of sleep. His mother is Pasithea, the goddess of hallucination. Phantasos is nephew to Thanatos, the God of death (Hypnos brother), his grandmother is Nyx, Goddess of the night and his grandfather is Erebus, the god of darkness. Phantasos translated into English roughly means “apparition”.