trihedral

American  

[trahy-hee-druhl] / traɪˈhi drəl /

adjective

Geometry.

1. having, or formed by, three planes meeting in a point.

   a trihedral angle.

---

noun

1. a trihedron.

trihedral British  

/ traɪˈhiːdrəl /

adjective

1. having or formed by three plane faces meeting at a point

---

noun

1. a figure formed by the intersection of three lines in different planes

Other Word Forms

• subtrihedral
  adjective

---

Etymology

Origin of trihedral

First recorded in 1780–90; tri- + -hedral

---

Example Sentences

See Examples For:

trihedral

Demonstrate that if two trihedral angles have dihedral angles respectively equal, then their face angles are equal.

From Time Magazine Archive

The connexion indicated between triangles and trihedral angles will also be recognized in Prop.

From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" by Various

A triangle and a trihedral angle are therefore reciprocal figures.

From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" by Various

The angle between two planes is termed dihedral, between three trihedral, between any number more than three polyhedral.

From Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1 by Various

The three points in the first, together with the three lines joining them two and two, form a triangle; the three planes in the second and their three lines of intersection form a trihedral angle.

From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" by Various

Random Word

Spin the wheel and learn a new word!

---