or·tho·cen·ter 
(ôrthō-sĕn′tər)
(ôrthō-sĕn′tər)n.
The point of intersection of the three altitudes of a triangle.
- uncommonness
- uncommunicative
- uncommunicatively
- uncommunicativeness
- Uncompahgre Plateau
- uncompensated
- uncompetitive
- uncompetitively
- uncompetitiveness
- uncomplaining
- uncomplainingly
- uncompleted
- uncomplicated
- uncomplimentary
- uncomprehending
- uncomprehendingly
- uncompromisable
- uncompromising
- uncompromisingly
- uncomputerized
- unconceivable
- unconceivably
- unconcern
- unconcerned
- unconcernedly