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ultra-clean
ultra-clean adj.
Brit. 
/ˌʌltrəˈkliːn/
, /ˌʌltrəˈkliːn/U.S. /ˌəltrəˈklin/
/ˌəltrəˈklin/ΚΠ
1970 Sci. Jrnl. Apr. 42 Cleaning these parts is a major branch of ultraclean technology involving the application of special solvents, the use of ‘sonication’—ultrasonic vibration—to jar the dirt loose,..and many other highly specialized procedures.
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as lemmas
- preceramic
- precerebellar
- precerebral
- precerebroid
- preces
- precess
- precessed
- precesses
- precessing
- precession
- precession of the equinoxes
- precessional
- precessions
- precessor
- prechamber
- prechaucerian
- prechemical
- prechilled
- prechloroform
- prechordal
- prechordate
- prechoroid
- prechristian
- prechristianic
- prechristmas