A principal spanwise member of the structural framework of an airplane wing, aileron, stabilizer, and such; it may be of one-piece design or a fabricated section.

Any transparent or translucent, nonmetallic, light-colored, readily cleavable, crystalline mineral; examples are calespar and fluorspar.

A small clay vein in a coal seam.

A long, round stick of steel or wood, often tapered at one or both ends, and usually a part of a ship's masts or rigging.