- archarch1 [ärch]n.[ME < OFr arche < ML arca < L arcus, arch: see ARC]1. a curved structure, as of masonry, that supports the weight of material over an open space, as in a bridge, doorway, etc.2. any similar structure, as a monument3. the form of an arch4. anything shaped like an arch; specif., an archlike anatomical part [the dental arch, arch of the foot, etc.]vt.1. to provide with an arch or arches2. to cause to take the form of an arch; curve or bend3. to span as an archvi.to form an archarch2 [ärch]adj.[< ARCH-; with changed meaning because of use in archknave, archrogue]1. main; chief; principal [the arch villain]2. clever; crafty3. gaily mischievous; pert [an arch look]
English World dictionary. V. Neufeldt. 2014.