Noah Webster
Rare
RARE, adjective [Latin rarus, thin.]
1. Uncommon; not frequent; as a rare event; a rare phenomenon.
2. Unusually excellent; valuable to a degree seldom found.
RARE work, all fill'd with terror and delight.
Above the rest I judge one beauty rare
3. Thinly scattered.
4. Thin; porous; not dense; as a rare and attenuate substance.
Water is nineteen times lighter and by consequence nineteen times rarer than gold.
5. Nearly raw; imperfectly roasted or boiled; as rare beef or mutton; eggs roasted rare