trihedron
/trʌɪˈhiːdrən
/noun (plural trihedra /trʌɪˈhiːdrə/ or trihedrons)
A solid figure having three sides or faces (in addition to the base or ends).From now on, we will move trihedrons to restore their positions and colors, without moving dihedras....
- A line making equal angles with the edges of a trihedron is called an isoclinal line of the trihedron.
- If this antenna is perfect, the axes of the two trihedrons would be respectively parallel to each other.
Origin
Early 19th century: from tri- 'three' + -hedron, on the pattern of words such as polyhedron.