ἄγνος

Etymology
From the adjective

Noun

 * 1) chaste tree
 * 2) type of bird
 * 1) type of bird
 * 1) type of bird
 * 1) type of bird

Usage notes
The branches of the chaste tree were strewn by young women on their beds at the Thesmophoria. The notion of chastity was an association from the word's similarity to.