Vertical plane

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(Conic Sections) A plane passing through the vertex of a cone, and through its axis.
(Projections) Any plane which passes through a vertical line.
(Persp.) The plane passing through the point of sight, and perpendicular to the ground plane, and also to the picture.

See also: Vertical, Vertical, Vertical

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in classic literature ?
You observe that in the ordinary swimming position of the Sperm Whale, the front of his head presents an almost wholly vertical plane to the water; you observe that the lower part of that front slopes considerably backwards, so as to furnish more of a retreat for the long socket which receives the boom-like lower jaw; you observe that the mouth is entirely under the head, much in the same way, indeed, as though your own mouth were entirely under your chin.
Strong lines radiated in a vertical plane from a common centre, where the insect had its station; but only two of the rays were connected by a symmetrical mesh-work; so that the net, instead of being, as is generally the case, circular, consisted of a wedge-shaped segment.
"The defender may not 'belly up' or use the lower part of the body or arms to cause contact outside his vertical plane or inside the opponent's vertical plane."
The fourth lens is in a separate housing, along the same vertical plane. Ever since the Huawei P10, Huawei has continued to work with Leica to develop its cameras and this time won't be any different, as the Leica branding can be seen etched on the body.
Not a stupid taildrop, but going from horizontal plane to vertical plane is very addictive.
Sagittal section of the left condyle: Larger condyle dimensions are observed in the vertical plane. Observe the irregular cortical and bone sclerosis (yellow arrow).
Also, the orientation of its onboard sensors continuously changes, when the MR is moving in the vertical plane. It can distort the obstacles picture around the MR and leads to the design of incorrect motion trajectories, when traditional methods are used.
After the MPSB process, the shape error of the profile is mainly due to the springback along the x- y horizontal plane and the x-z vertical plane. Therefore, we used the following method based on reverse compensation of the springback value to modify the die units' surface.
The trajectory equation in the vertical plane can also be expressed as follows:
They also compared the mixture distribution for the various SOI timings on a vertical plane passing through the spark plug.
The craniofacial morphology of orthodontic patients with skeletal AOB is characterized by vertical disproportions in vertical plane caused by imbalance between anterior and posterior facial heights (AFH/ PFH) and between upper and lower anterior facial heights (UAFH/ LAFH).
Canting error on target occurs when the barrel axis is rotated out of the vertical plane. As a scope is mounted well above the bore axis, the bullet must cross the line of sight at about 25 yards and then again cross the line of sight at the point where the rifle is sighted in.