Seltenheit.
ETYM Old Eng. curiouste, curiosite, Old Fren. curioseté, curiosité, French curiosité, from Latin curiositas, from curiosus. Related to Curious, Curio.
A state in which one wants to learn more about something; SYN. wonder.
ETYM Latin raritas: cf. French rareté. Related to Rare.
1. A rarified quality; SYN. tenuity, low density.
2. Noteworthy scarcity; SYN. rareness, infrequency.