Arch (#), n. [F. arche, fr. LL. arca, for arcus. See Arc.]
1. Geom.
Any part of a curved line.
2. Arch. (a)
Usually a curved member made up of separate wedge-shaped solids, with the joints between them disposed in the direction of the radii of the curve; used to support the wall or other weight above an opening. In this sense arches are segmental, round (i. e., semicircular), or pointed.
(b)
A flat arch is a member constructed of stones cut into wedges or other shapes so as to support each other without rising in a curve.
⇒ Scientifically considered, the arch is a means of spanning an opening by resolving vertical pressure into horizontal or diagonal thrust.
3.
Any place covered by an arch; an archway; as, to pass into the arch of a bridge.
4.
Any curvature in the form of an arch; as, the arch of the aorta.
"Colors of the showery
arch."
Milton.
Triumphal arch, a monumental structure resembling an arched gateway, with one or more passages, erected to commemorate a triumph.
© Webster 1913.
Arch, v. t. [imp. & p. p. Arched (#); p. pr. & vb. n. Arching.]
1.
To cover with an arch or arches.
2.
To form or bend into the shape of an arch.
The horse arched his neck.
Charlesworth.
© Webster 1913.
Arch, v. i.
To form into an arch; to curve.
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© Webster 1913.
Arch (#), a. [See Arch-, pref.]
1.
Chief; eminent; greatest; principal.
The most arch act of piteous massacre.
Shak.
2.
Cunning or sly; sportively mischievous; roguish; as, an arch look, word, lad.
[He] spoke his request with so arch a leer.
Tatler.
© Webster 1913.
Arch, n. [See Arch-, pref.]
A chief.
[Obs.]
My worthy arch and patron comes to-night.
Shak.
© Webster 1913.