Definition of "quadrantal" []

• An ancient Roman unit of measure for liquids. (noun)

Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License

• "I went up above the cloud into the quadrantal system operating above three thousand feet, where to avoid collision one had to fly on a steady regulated level according to the direction one was heading: in our case, going north west, four thousand five hundred or six thousand five hundred or eight thousand five hundred, and so on up."
• "Above the arches of the nave are small double round-headed openings into a very narrow triforium walk, which is vaulted, as at Gloucester, with a quadrantal arch."
• "The nonius, never in common use, consisted essentially of forty-six concentric circles divided into quadrants by two diameters at right angles to each other, each quadrantal arc being divided into equal parts, the number of parts diminishing from ninety for the outermost arc to forty-five for the innermost."