tri·plane 
(trīplān′)
(trīplān′)n.
An airplane with wings placed above each other in three levels.
triplanec. 1916 Sopwith Triplane N500
- uncommunicativeness
- Uncompahgre Plateau
- uncompensated
- uncompetitive
- uncompetitively
- uncompetitiveness
- uncomplaining
- uncomplainingly
- uncompleted
- uncomplicated
- uncomplimentary
- uncomprehending
- uncomprehendingly
- uncompromisable
- uncompromising
- uncompromisingly
- uncomputerized
- unconceivable
- unconceivably
- unconcern
- unconcerned
- unconcernedly
- unconcernedness
- unconditional
- unconditionality