1870, shortening of kilogram. Slang shortening key (in drug trafficking) is attested from 1968.
commercial motor oil additive, probably an initialism (acronym) of scientifically treated petroleum. As the street name of a type of psychedelic drug, attested from 1967.
"of or pertaining to recreation; used for or concerned with recreation," 1650s, from recreation + -al (1). Related: Recreationally. Recreational drug is attested from 1967.
1960s in drug-use sense, from ozone (n.), which is found high in the atmosphere; the related verb to zone is from 1980s.
"pertaining to administration, having to do with the managing of public affairs," 1731, from Latin administrativus, from administrat-, past-participle stem of administrare "to manage, control, superintend" (see administer). Related: Administratively.
"manage or direct affairs," 1630s, from Latin administratus, past participle of administrare "manage, control, superintend" (see administer) or else a back-formation from administrator, administration. Related: Administrated; administrating.
"of or pertaining to nutrition, food, or nourishment," 1856, from Greek trophikos, from trophe "nourishment, food" (see -trophy).