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
Therasia	-	Late Roman
Onni	ON-nee	Finnish
Tatenda	-	Southern African, Shona
Phil	FIL	English
Haniyya	-	Arabic
Judita	-	Lithuanian, Czech, Slovak