Noun
(architecture) a masonry construction (usually curved) for spanning an opening and supporting the weight above it

Noun
a passageway under an arch

Noun
a curved bony structure supporting or enclosing organs (especially arches of the feet)

Noun
a curved shape in the vertical plane that spans an opening

Verb
form an arch or curve; "her back arches"; "her hips curve nicely"

Adjective S.
(used of behavior or attitude) characteristic of those who treat others with condescension

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n.
Any part of a curved line.

n.
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.

n.
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.

n.
Any place covered by an arch; an archway; as, to pass into the arch of a bridge.

n.
Any curvature in the form of an arch; as, the arch of the aorta.

v. t.
To cover with an arch or arches.

v. t.
To form or bend into the shape of an arch.

v. i.
To form into an arch; to curve.

a.
Chief; eminent; greatest; principal.

a.
Cunning or sly; sportively mischievous; roguish; as, an arch look, word, lad.

n.
A chief.

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Arch

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. &hand; 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.

Arch

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.

Arch

Arch, v. i. To form into an arch; to curve.

Arch

Arch , a. [See Arch-, pref.] 1. Chief; eminent; greatest; principal.

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

Arch, n. [See Arch-, pref.] A chief. [Obs.]

My worthy arch and patron comes to-night.

arch

*arch . [Gr. chief, commander, to rule. See Arch, a.] A suffix meaning a ruler, as in monarch (a sole ruler).

Any part of a curved line.

To cover with an arch or arches.

To form into an arch; to curve.

Chief; eminent; greatest; principal.

A chief.

A suffix meaning a ruler, as in monarch (a sole ruler).