(1):
(n.) A geometrical figure, consisting of four equal straight lines, and having two of the interior angles acute and two obtuse; a rhombus; a lozenge.
(2):
(n.) A pointed projection, like a four-sided pyramid, used for ornament in lines or groups.
(3):
(n.) A precious stone or gem excelling in brilliancy and beautiful play of prismatic colors, and remarkable for extreme hardness.
(4):
(n.) One of a suit of playing cards, stamped with the figure of a diamond.
(5):
(a.) Resembling a diamond; made of, or abounding in, diamonds; as, a diamond chain; a diamond field.
(6):
(n.) The smallest kind of type in English printing, except that called brilliant, which is seldom seen.
(7):
(n.) The infield; the square space, 90 feet on a side, having the bases at its angles.