αγελάδα/ agelada pronounced "a-yah-lah-da"
Hera caused Io in the form of a cow to flee from a gadfly.
Hera the goddess of the heavens, sacred animals are the cow and the peacock
Hera
The Sun Gods sarced animal is the sun cow. In some greek Myths Heros eat Apollos sacred sun cow and they would have bad fourtune or be killed by the mighty god.
The peacock is one of Hera's symbols. The cow and the peacock were sacred to Hera. She did not turn into one, however.
It probably means protectress. Or mistress, or ripe for marriage, or young cow. (Sorry, but etymology is often like this)
Isis is sometimes depicted with a cow headdress. In Greek mythology there was not a cow-headed goddess per se, but the queen Io was transformed into a white heifer by Zeus to conceal her from his jealous wife Hera. But in Egyptian mythology there was a cow-headed goddess named Hathor, and she was a goddess of love.
There was no exact female equivalent to the Minotaur in Greek mythology, although Io, Europa, and Hera all had associations with bulls/cows, they were not depicted with cow/heifer heads. However, in Egyptian mythology you find the goddesses Hathor, Bat, and Nut depicted with cow heads, or horns, or bodies.
Hera is the Greek goddess of motherhood and one of her symbols is the cow. (ok you've got to say, that's really funny!!)
You may be thinking of the abduction of Europa by Zeus (the Greek Jupiter), who disguised himself in the form of a bull? Wikipedia will give you the details.
A "cow" is a cow when that "cow" is a she and she has given birth to at least one calf.