hens' teeth

Something very scarce (because hens have no teeth). Typically used in phrases like "rarer than hens' teeth." I can hardly believe your brother got an A on his final exam—grades like that are rarer than hens' teeth for him!

Common Names:

Name	Pronounced	Usage
Nazario	nah-TSAH-ryo (Italian), nah-THAH-ryo (Spanish), nah-SAH-ryo (Latin American Spanish)	Italian, Spanish
Patty	PAT-ee	English
Henna	HEN-nah	Finnish
Symeonu	-	Old Church Slavic
Fryderyka	fri-de-RI-kah	Polish
Arabinda	-	Bengali, Indian, Odia