ridge

A Dictionary of Aviation · 1911 · p. 22

zid3. the highest part of the roof of a bilding; the meeting of the upper ends of the rafters. rift cift n. 4. an opening made by riving or splitting; a fi ure, a cleft: as, a *r1ft in the clouds. 2. a discontinuity in a fluid caused by a body coursing swiftly thru it.