rara avis
         n 1: a rare or unique person [syn: {rare bird}, {rara avis}]

English Dictionary: Ryrvik	by the DICT Development Group
From WordNet (r) 3.0 (2006) [wn]:
rarefaction n a decrease in the density of something; "a sound wave causes periodic rarefactions in its medium"
From WordNet (r) 3.0 (2006) [wn]:
rear back v rear backwards on its hind legs; "the frightened horse reared back" start with anger or resentment or in protest
From WordNet (r) 3.0 (2006) [wn]:
Rorippa islandica n annual or biennial cress growing in damp places sometimes used in salads or as a potherb; troublesome weed in some localities Synonym(s): marsh cress, yellow watercress, Rorippa islandica
From WordNet (r) 3.0 (2006) [wn]:
Roy Orbison n United States composer and rockabilly tenor popular in the 1950s (1936-1988) Synonym(s): Orbison, Roy Orbison
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Rarefaction \Rar`e*fac"tion\, n. [Cf. F. rar[82]faction. See       {Rarefy}.]       The act or process of rarefying; the state of being rarefied;       -- opposed to condensation; as, the rarefaction of air.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Rarification \Rar`i*fi*ca"tion\, n.       See {Rarefaction}. [R.] --Am. Chem. Journal.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Vassal \Vas"sal\, n. [F., fr. LL. vassallus, vassus; of Celtic       origin; cf. W. & Corn. gwas a youth, page, servant, Arm. gwaz       a man, a male. Cf. {Valet}, {Varlet}, {Vavasor}.]       1. (Feud. Law) The grantee of a fief, feud, or fee; one who             holds land of superior, and who vows fidelity and homage             to him; a feudatory; a feudal tenant. --Burrill.          2. A subject; a dependent; a servant; a slave. [bd]The             vassals of his anger.[b8] --Milton.          {Rear vassal}, the vassal of a vassal; an arriere vassal.
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Roorback \Roor"back\, Roorbach \Roor"bach\, n.       A defamatory forgery or falsehood published for purposes of       political intrigue. [U.S.]          Note: The word originated in the election canvass of 1844,                when such a forgery was published, to the detriment of                James K. Polk, a candidate for President, purporting to                be an extract from the [bd]Travels of Baron                Roorbach.[b8]
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Roorback \Roor"back\, Roorbach \Roor"bach\, n.       A defamatory forgery or falsehood published for purposes of       political intrigue. [U.S.]          Note: The word originated in the election canvass of 1844,                when such a forgery was published, to the detriment of                James K. Polk, a candidate for President, purporting to                be an extract from the [bd]Travels of Baron                Roorbach.[b8]
From U.S. Gazetteer (1990) [gazetteer]:
Rio Arriba County, NM (county, FIPS 39)       Location: 36.50914 N, 106.69709 W       Population (1990): 34365 (14357 housing units)       Area: 15172.4 sq km (land), 99.6 sq km (water)