the GNU version of the Collaborative International Dictionary of English
adj. Having the form of an arch; curved.
The Century Dictionary and Cyclopedia
Bow-shaped; curved; arched.
Having the form or structure of the shell of the molluscan genus Area.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. forming or resembling an arch
Word Usage
"He would search for the minuscule and the uncelebrated, the unlikely structures of elemental form—the helix inside honeycomb, the symmetry of a thyme leaf, the arciform of a daylily."