1550s, "one who purifies," agent noun from purify. As a type of mechanical apparatus, from 1834 (in reference to coal gas). Purificator in the ecclesiastical sense of "cloth used to wipe the chalice, etc., during mass" is by 1853, an agent-noun from Latin purificare.
U.S. car rental company, according to company history founded 1946 at Willow Run Airport in Detroit by U.S. businessman Warren Avis and named for him.
Carbon 14, long-lived radioactive isotope used in dating organic deposits, is from 1936. Carbon-dating (using carbon 14) is recorded from 1958. Carbon cycle is attested from 1912; carbon footprint was in use by 2001. Carbon-paper "paper faced with carbon, used between two sheets for reproduction on the lower of what is drawn or written on the upper" is from 1855, earlier it was carbonic paper (1850).
"anything inferior," 1940s, agent noun from clunk (v.), probably in imitation of the sounds made by old machinery. Specific sense of "old car" was in use by 1936.