cry·o·gen·ics 
(krī′ə-jĕnĭks)
(krī′ə-jĕnĭks)n. (used with a sing. or pl. verb)
The production of low temperatures or the study of low-temperature phenomena. Also called cryogeny.
- unnecessary
- unnerve
- unnervingly
- unnoticeable
- unnoticeably
- unnumbered
- unobjectionable
- unobstructed
- unobtrusive
- unobtrusively
- unobtrusiveness
- unoccupied
- unofficial
- unofficially
- unopposed
- unorganized
- unoriginal
- unornamented
- unorthodox
- unorthodoxly
- unorthodoxy
- unostentatious
- unostentatiously
- unpack
- unpacked