1870, shortening of kilogram. Slang shortening key (in drug trafficking) is attested from 1968.

"domestic administration, the act of managing (a farm or crop)," a word now obsolete, 1630s, from manager + -y (4); or perhaps from manage + -ery.

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.

"part of a shoe above the sole," 1789, from upper (adj.). Sense of "stimulant drug" is from 1968, agent noun from up (v.).

"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.

"substance or material suitable for food," 1870, from food + stuff (n.). Related: Foodstuffs.

"of or pertaining to nutrition, food, or nourishment," 1856, from Greek trophikos, from trophe "nourishment, food" (see -trophy).