chem·trail 
(kĕmtrāl′)
(kĕmtrāl′)n.
A contrail thought to contain a chemical agent that a government is dispersing as part of a conspiracy.
[CHEM(ICAL) + (CON)TRAIL.]
- uncompleted
- uncomplicated
- uncomplimentary
- uncomprehending
- uncomprehendingly
- uncompromisable
- uncompromising
- uncompromisingly
- uncomputerized
- unconceivable
- unconceivably
- unconcern
- unconcerned
- unconcernedly
- unconcernedness
- unconditional
- unconditionality
- unconditionally
- unconditioned
- unconditionedness
- unconditioned response
- unconditioned stimulus
- unconformability
- unconformable
- unconformably