Vertical plane. (a) (Conic Sections) A plane passing through the vertex of a cone, and through its axis. (b) (Projections) Any plane which passes through a vertical line. (c) (Persp.) The plane passing through the point of sight, and perpendicular to the ground plane, and also to the picture.Vertical sash, a sash sliding up and down. Cf. French sash, under 3d Sash.Vertical steam engine, a steam engine having the crank shaft vertically above or below a vertical cylinder.

(Ver"ti*cal), n.

1. Vertical position; zenith. [R.]

2. (Math.) A vertical line, plane, or circle.

Prime vertical, Prime vertical dial. See under Prime, a.

(Ver`ti*cal"i*ty) n. The quality or state of being vertical; verticalness. [R.]

The different points of the verticality.
Sir T. Browne.

(Ver"ti*cal*ly) adv. In a vertical manner, position, or direction; perpendicularly; as, to look down vertically; to raise a thing vertically.

(Ver"ti*cal*ness), n. Quality or state of being vertical.

(Ver"ti*cil) n. [L. verticillus, dim. of vertex a whirl: cf. F. verticille. See Vertex.] (Bot.) A circle either of leaves or flowers about a stem at the same node; a whorl. [Written also verticel.]

(Ver`ti*cil*las"ter) a. [NL., fr. L. verticillus a whirl + aster a star.] (Bot.) A whorl of flowers apparently of one cluster, but composed of two opposite axillary cymes, as in mint. See Illust. of Whorl.

(Ver*tic"il*late Ver*tic"il*la`ted) a. [See Verticil.] (Bot. & Zoöl.) Arranged in a transverse whorl or whorls like the rays of a wheel; as, verticillate leaves of a plant; a verticillate shell.

(||Ver`ti*cil"lus) n. [L., a whirl.] (Bot.) A whorl; a verticil.

(Ver*tic"i*ty) n. [Cf. F. verticité. See Vertex.] The quality or power of turning; revolution; rotation. [R.] Locke.

I hardly believe he hath from elder times unknown the verticity of the loadstone.
Sir T. Browne.

(Ver"ti*cle) n. [L. verticula a joint.] An axis; hinge; a turning point. E. Waterhouse.

(Ver*tig"i*nate) a. Turned round; giddy. [R.] Coleridge.

(Ver*tig"i*nous) a. [L. vertiginosus, fr. vertigo a whirling around, giddiness: cf. F. vertigineux. See Vertig.]

1. Turning round; whirling; rotary; revolving; as, vertiginous motion.

Some vertiginous whirl of fortune.
De Quincey.

2. Affected with vertigo; giddy; dizzy.

They [the angels] grew vertiginous, and fell from the battlements of heaven.
Jer. Taylor.

Ver*tig"i*nous*ly, adv.Ver*tig"i*nous*ness, n.

etc.) A line parallel to the sides of a page or sheet, in distinction from a horizontal line parallel to the top or bottom.

  By PanEris using Melati.

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