roughing pump
noun
A pump for evacuating a system from atmospheric pressure to a lower pressure at which a second pump can begin to operate.
Origin
Early 20th century; earliest use found in U.S. Patents.
- insolubility
- insolubilize
- insoluble
- insolubly
- insolvable
- insolvency
- insolvent
- in so many words
- in someone's bad (or good) books
- in someone's black books
- in someone's confidence
- in someone's corner
- in someone's hip pocket
- in someone's keeping
- in someone's lap
- in someone's name
- in someone's place
- in someone's pocket
- in someone's wisdom
- in someone/thing's (own) way
- in some sort
- insomnia
- insomniac
- insomuch
- in sooth