| BOOTJACK | • bootjack n. A V-shaped, or forked, device for pulling off boots. • bootjack v. (Slang) to steal. • Bootjack prop.n. A census-designated place in Mariposa County, California, United States. |
| DOORJAMB | • doorjamb n. Either of the upright posts on either side of a door, which together support a lintel. • DOORJAMB n. one of the two vertical members forming the sides of a doorframe, aka doorpost. |
| JACKAROO | • jackaroo n. (Australia, Queensland, obsolete) A white man living outside of a white settlement. • jackaroo n. (Australia) A trainee station manager or owner, working as a stockman or farm hand; formerly, a young… • jackaroo v. (Intransitive) To work as a jackaroo. |
| JACKBOOT | • jackboot n. A glossy leather calf-covering military boot, commonly associated with German soldiers of the WWII era. • jackboot n. (Informal, by extension) The spirit that motivates a totalitarian or overly militaristic regime or policy. • jackboot v. (Transitive) To stamp on with a jackboot. |
| JACKEROO | • jackeroo n. Alternative spelling of jackaroo. • jackeroo v. Alternative spelling of jackaroo. • JACKEROO n. (Australian) a newcomer gaining experience at a sheep-station. |
| JAMBOOLS | • jambools n. Plural of jambool. • JAMBOOL n. (Sanskrit) the rose-apple tree, also JAMBU, JAMBOLAN, JAMBUL. |
| JARGOONS | • jargoons n. Plural of jargoon. • JARGOON n. (French) a brilliant pale or colourless zircon. |
| JEROBOAM | • jeroboam n. Alternative letter-case form of Jeroboam: a very large wine bottle. • Jeroboam prop.n. First king of the Kingdom of Israel. • Jeroboam n. A bottle of champagne or Burgundy wine containing 3 liters of fluid, four times the volume of a standard bottle. |
| JILLAROO | • jillaroo n. (Australia) A female jackaroo, a woman who does the job of a jackaroo. • JILLAROO n. (Australian) a female jackaroo (apprentice at a cattle station). |
| JOBATION | • jobation n. An extensive rebuke or telling-off; a long criticism or admonitory lecture. • JOBATION n. a long, tedious rebuke or harangue, also JAWBATION. |
| JOHNBOAT | • johnboat n. A flat-bottomed boat with a very shallow draft, whose bow and stern are both squared off. • JOHNBOAT n. a narrow square-ended boat. |
| JONCANOE | • JONCANOE n. a boisterous West Indian dance, also JUNKANOO. |
| JUNKANOO | • junkanoo n. A parade held in the Bahamas. • junkanoo n. (Music) A style of goombay traditionally played on goatskin drums and cowbells during the parade. • Junkanoo n. Alternative letter-case form of junkanoo. |
| NONMAJOR | • nonmajor n. (US) A student who is not a major (specialist in one area). • NONMAJOR n. a student who is not majoring in a specific subject. |