Mythology & Beliefs: Deino In Greek and Roman Mythology, Deino was one of several Graeae.
Deino in Wikipedia
The Graeae (English translation: "old women", "gray ones", or
"gray witches"; alternatively spelled Graiai (Γραῖαι), Graiae,
Graii), were three sisters who shared one eye and one tooth
among them. They are one of several trios of archaic goddesses
in Greek mythology. The Graeae were daughters of Phorcys, one
aspect of the "old man of the sea," and Ceto. Thus, they were
among the Phorcydes, all of which were primordial deities of
the sea or of the earth. The Graiae were sisters to the
Gorgons. The Graeae took the form of old grey-haired women;
though, at times poets euphemistically described them as
"beautiful." Their age was so great that a human childhood for
them was hardly conceivable. Hesiod reports their names as
Deino (Δεινώ "dread", the dreadful anticipation of horror)...