In rarer cases, if I may chance a misinterpreted mashup of my own, one can scratch an actress and find an actor.
For those with rarer blood types, there are frequent shortages.
If you guessed Syria, you're in a rarer group than you might realize.
And ours, rarer still: a representative republic, a country owned by the people.
Complaints of voter fraud are rare; complaints of voter suppression are rarer still.
The latter will find many of the rarer British orchids in the central "dingles" and on the more remote western borders.
The rarer their occurrence, the greater the significance attached to them.
Horace was again endowed by nature with another and rarer and equally necessary gift,—the sense of artistic expression.
He is exactly like the magistrates in old days, but he and his kind get rarer every year.
It was easy enough to get at the political Vard: the other aspect was rarer and more instructive.
"unusual," late 14c., "thin, airy, porous;" mid-15c., "few in number and widely separated, sparsely distributed, seldom found;" from Old French rere "sparse" (14c.), from Latin rarus "thinly sown, having a loose texture; not thick; having intervals between, full of empty spaces," from PIE *ra-ro-, from root *ere- "to separate; adjoin" (cf. Sanskrit rte "besides, except," viralah "distant, tight, rare;" Old Church Slavonic rediku "rare," Old Hittite arhaš "border," Lithuanian irti "to be dissolved"). "Few in number," hence, "unusual." Related: Rareness. In chemistry, rare earth is from 1818.
"undercooked," 1650s, variant of Middle English rere, from Old English hrere "lightly cooked," probably related to hreran "to stir, move, shake, agitate," from Proto-Germanic *hror- (cf. Old Frisian hrera "to stir, move," Old Saxon hrorian, Dutch roeren, German rühren, Old Norse hroera), from PIE base *kere- "to mix, confuse; cook" (cf. Greek kera- "to mix," krasis "mixture"). Originally of eggs, not recorded in reference to meat until 1784, and according to OED, in this sense "formerly often regarded as an Americanism, although it was current in many English dialects ...."
"rise up," 1833, dialectal variant of rear (v.). Sense of "eager" (in raring to go) first recorded 1909. Related: Rared; raring.