The cough drop and the heraldic diamond share a name that may trace to ancient Gaulish words for flat stones.
A small medicinal tablet dissolved in the mouth, or a diamond-shaped figure in heraldry and design.
From Old French losenge meaning flattery or windowpane, possibly from a pre-Roman Gaulish or Iberian word for flat stone Key roots: *lausa (Pre-Roman (Gaulish or Iberian): "flat stone, slab").
In medieval French, losenge also meant flattery or deception — possibly because flattery is a sugar-coated thing, like the tablet. In heraldry, the lozenge shape is specifically used to display the arms of women, a convention dating to the 14th century that persists in some traditions today.