roof jack
/ˈruːf dʒak/ /ˈrʊf dʒak/originally and chiefly North American
noun
1A platform or other support erected on a roof to facilitate repair, painting, etc.
2A smoke vent of a chimney; (also) an airtight fitting attached to the roof and joining the internal and external sections of a vent pipe.
3A pole supporting the roof of a tent. rare.
Origin
Late 19th century; earliest use found in The San Francisco Chronicle. From roof + Jack.
- double exposure
- double-faced
- double fault
- double feature
- double figures
- double first
- double flat
- double-fronted
- double fugue
- double-glaze
- double glazing
- Double Gloucester
- double-handed
- double harness
- double-headed
- double-header
- double helix
- double-hung
- double indemnity
- double jeopardy
- double-jointed
- double-jointedness
- double-knit
- double knitting
- double lock