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curio: curio: see cure
curious: curious: see cure
amicus curiae: 1610s, Latin, literally "friend of the court;" plural is amici curiae. From Latin amicus "friend," related to amare "to love" (see Amy) + curia "court" (see curia).
curia (n.): c. 1600, one of the ten divisions of each of the three ancient Roman tribes; also "the Senate-house of Rome," from Latin curia "court," perhaps from *co-wiria "community of men." Transferred to the Papal court (1840).
curie (n.): "unit of radioactivity," 1910, named for Pierre Curie (1859-1906) or his wife, Marie (1867-1934), discoverers of radium.
curio (n.): "piece of bric-a-brac from the Far East," 1851, shortened form of curiosity (n.).
curiosity (n.): late 14c., "careful attention to detail," also "desire to know or learn" (originally usually in a bad sense), from Old French curiosete "curiosity, avidity, choosiness" (Modern French curiosité), from Latin curiositatem (nominative curiositas) "desire of knowledge, inquisitiveness," from curiosus (see curious). Neutral or good sense is from early 17c. Meaning "an object of interest" is from 1640s.
curious (adj.): mid-14c., "eager to know" (often in a bad sense), from Old French curios "solicitous, anxious, inquisitive; odd, strange" (Modern French curieux) and directly from Latin curiosus "careful, diligent; inquiring eagerly, meddlesome," akin to cura "care" (see cure (n.)). The objective sense of "exciting curiosity" is 1715 in English. In booksellers' catalogues, the word means "erotic, pornographic." Curiouser and curiouser is from "Alice in Wonderland" (1865).
curium (n.): 1946, named by U.S. chemist Glenn T. Seaborg, who helped discover it in 1944, for the Curies (see Curie).
Dioscuri (n.): Latinized form of Greek Dioskouroi, literally "Zeus' boys," from Dios, genitive of Zeus (see Zeus) + kouroi, plural of kouros "boy, son" (see crescent).
incurious (adj.): 1560s, "negligent, heedless," from Latin incuriosus "careless, negligent, unconcerned," from in- "not, opposite of, without" (see in- (1)) + curiosus (see curious). Meaning "uninquisitive" is from 1610s. Objective sense of "unworthy of attention" is from 1747.
insecurity (n.): 1640s, from Medieval Latin insecuritas, from insecurus (see insecure). Specific psychological sense is by 1917.
manicurist (n.): 1884, from manicure (n.) after its sense shifted + -ist.
mercurial (adj.): late 14c., "pertaining to the planet Mercury" (see Mercury). Meaning "sprightly, volatile, quick" (1590s) is from supposed qualities of those born under the planet Mercury (they also are the qualities of the god Mercury), probably also partly by association with the qualities of quicksilver. A variant in this sense was mercurious (1590s). Related: Mercurially; mercuriality.
mercuric (adj.): 1828, in chemistry, from mercury + -ic.
obscurity (n.): late 15c., "absence of light;" 1610s with meaning "condition of being unknown;" from obscure (adj.) + -ity; or else from Middle French obscurité, variant of Old French oscureté "darkness, gloom; vagueness, confusion; insignificance" (14c.), from Latin obscuritatem (nominative obscuritas) "darkness, indistinctness, uncertainty," from obscurus.
security (n.): mid-15c., "condition of being secure," from Latin securitas, from securus "free from care" (see secure). Replacing sikerte (early 15c.), from an earlier borrowing from Latin; earlier in the sense "security" was sikerhede (early 13c.); sikernesse (c. 1200).

Meaning "something which secures" is from 1580s; "safety of a state, person, etc." is from 1941. Legal sense of "property in bonds" is from mid-15c.; that of "document held by a creditor" is from 1680s. Phrase security blanket in figurative sense is attested from 1966, in reference to the crib blanket carried by the character Linus in the "Peanuts" comic strip (1956).
uncurious (adj.): 1560s, "not inquisitive," from un- (1) "not" + curious (adj.). From 1680s as "not odd or strange."