arch Definition

arch¹
noun arches

1. A curved structure forming an opening, and consisting of wedge-shaped stones or other pieces supporting each other by mutual pressure, used to sustain an overlying weight such as a roof or bridge, or for ornament.

Thesaurus: curve, arc, bend, bow, archway, cupola, dome, vault.
2. Anything shaped like an arch, especially a monument.
3. The bony structure of the foot between the heel and the toes, normally having an upward curve.
4. One of the four possible configurations of human fingerprints.

verb arches, arched, arching

1. To form an arch.

Thesaurus: arc, bow, curve, bend, vault, extend.
2. To span something like an arch.

Etymology: 14c: from Latin arcus bow.

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arch²
adj

1. Chief, principal.

Example: their arch enemy, the Penguin
Thesaurus: principal, chief, first, foremost, main, primary, major, greatest, highest, leading.
2. Most experienced.

Example: that arch crime writer, Jim Thompson
3. Cunning, knowing.

Example: gave an arch look
4. Self-consciously playful or coy.

Thesaurus: mischievous, roguish, waggish, wily, provocative, sly, frolicsome, playful.

Derivative: archly

See separate entry.

Derivative: archness
noun

Etymology: 17c: from arch- as in such combinations as ‘arch-villain'.