a small often medicated sweet

Miss Wepley rarely had recourse to her lozenges, but in case she should be taken with a fit of coughing she wished to have the emergency duly provided for — Saki

a figure with four equal sides and two acute and two obtuse angles; a diamond or rhombus

marble walks arranged in black and white lozenges — Henry James

in heraldry, a diamond-shaped charge on a coat of arms