The ability of an insulating material to withstand high voltage electric arc.

(geology) A tectonic plate convergent boundary in Micronesia

plural of Arabian mate

(chess) A checkmate pattern in which a rook provides the checkmate to the cornered king while being protected by a knight that also covers the only would-be escape square.

plural of arbitrary unit

Alternative spelling of archfiend

(sciences, technology) A relative unit of measurement to show the ratio of amount of substance, intensity, or other quantities, to a predetermined reference measurement.

(historical) A suggested location where the historical figure Joan of Arc, or her father, were from.

Epioblasma arcaeformis, an extinct species of freshwater mussel.

plural of arch-chief