# trihedral

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Related to trihedral: trihedron, trihedral angle

## tri·he·dral

(trī-hē′drəl)
Having or formed by three planes meeting at a point.
n.

## trihedral

(traɪˈhiːdrəl)
(Mathematics) having or formed by three plane faces meeting at a point
n
(Mathematics) a figure formed by the intersection of three lines in different planes
[C18: from tri- + Greek hedra base, seat + -al1]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

## tri•he•dral

(traɪˈhi drəl)

1. having, or formed by, three planes meeting in a point: a trihedral angle.
n.
2. the figure determined by three planes meeting in a point.
[1780–90]
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References in periodicals archive ?
At her side, a whining dog lies on the ground, as well as a crystal cast (a huge stone polyhedron) and a pot (in which a fire is burning and something is boiling in a trihedral vessel).
This is because dihedral scattering, trihedral scattering, and multiple bounce scattering between adjacent urban targets make the backscattered echoes superimposed together and cause saturation in some cases.
EcosatelYt is an inter-vine hoeing machine that uses draft power to rotate a trihedral ploughshare support mounted offcenter.
They concluded that using polyhedral spillway crests increases discharge coefficients and that the biggest increase in discharge coefficients of morning glory spillways happens when spillway crests are trihedral and at the same depth of submergence, discharge coefficients of spillways with polyhedral crests are higher than those for spillways with circular crests.
When models were created, the 3 parts (acromion, clavicle, and plate) were prepared with trihedral elements.
In the experiment, we use a 30 cm trihedral as the target.
The targets consists of two dihedral reflectors (T1, T2), two trihedral reflectors (T3, T4), and a metallic sphere (T5), as shown in Fig.
This feature, named Radar Cross Section (RCS), means mainly the reduction of the projected area combined to the suppression of the dihedral and trihedral effects.
Q = Directivity factor which is equals 2, 4, or 8 depending on whether the opening is at the center of the wall, a bihedral corner, or a trihedral corner respectively
A 1 m trihedral corner reflector is located 1.8 km away from the swath centre, and the imaging results after the sub-aperture MoCo and the improved MoCo are used to evaluate the MoCo performance.

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