quoin

• The two inner sides of each pair of skill facets form the half of a diamond or lozenge-shaped facet, called a "quoin," of which there are four. —  The Chemistry, Properties and Tests of Precious Stones
• So that below the girdle, we find twenty-five facets: 8 cross, 8 skill, 4 pavilion, 4 quoin, and 1 collet These, with the 33 of the crown, make 58, which is the usual number of facets in a brilliant, though this varies with the character, quality, and size of the diamond. —  The Chemistry, Properties and Tests of Precious Stones
• If one quoin was not enough to secure proper depression, a block or a second quoin was placed below the first. —  Artillery Through the Ages A Short Illustrated History of Cannon, Emphasizing Types Used in America
• They were used to move the carriage and to lift the breech of the gun so that the elevating quoin or screw might be adjusted. —  Artillery Through the Ages A Short Illustrated History of Cannon, Emphasizing Types Used in America
• The workman, beginning at the extreme left of his section, or at a quoin, advances to the right, carefully keeping to his line and frequently testing his work with the plumb-rule, spirit-level and straight-edge, until he reaches another angle, or the end of his section. —  Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 "Brescia" to "Bulgaria"

Allen's Synonyms and Antonyms

Used in the Same Context