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
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."
Triumphal arch, a monumental structure resembling
an arched gateway, with one or more passages, erected to commemorate a
Arch (ärch), a. [See Arch-,
pref.] 1. Chief; eminent; greatest;
The most arch act of piteous massacre.
2. Cunning or sly; sportively mischievous; roguish;
as, an arch look, word, lad.
[He] spoke his request with so arch a leer.
Arch, n. [See Arch-, pref.]
A chief. [Obs.]
My worthy arch and patron comes to-night.
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
The horse arched his neck.
Arch, v. i. To form into an arch; to