Latin rāra avis (“rare bird”), plural rarae aves
From Juvenal's Satires (6.165): Rara avis in terris nigroque simillima cycno ("a bird as rare upon the earth as a black swan").
rara avis (plural rara avises or rarae aves)
- A rare or unique person or thing.
- That Parsons girl is quite the rara avis if you ask me.
rare or unique person or thing