lozenge

Short definition from Wiktionary

Noun

1. 1
   A thin rhombus, having two acute and two obtuse angles.
2. 2
   A small tablet (originally diamond-shaped) or medicated sweet used to ease a sore throat.

Verb

1. 1
   To form into the shape of a lozenge.
2. 2
   To mark or emblazon with a lozenge.