Rara avis Share definition Flag An unusual or extraordinary person or thing; rarity; literally, "strange bird." A sweet haze veiled the sunset: cherries roasting in the Maricopas. He whispered, "Rara avis." Rara avis by Morgan T November 10, 2006 0 0 Get merch Get the Rara avis mug. Buy Now — $32.95 See more merch