The word lozenge leads a curious double life in English. In everyday speech, it means a small medicinal tablet designed to dissolve slowly in the mouth — a cough drop or throat sweet. In heraldry, geometry, and design, it refers to a diamond-shaped figure oriented with its points at top and bottom. These two seemingly unrelated meanings converge in the shape: medicinal lozenges were traditionally pressed into diamond shapes.
The word entered English in the 14th century from Old French losenge, which carried meanings including diamond-shaped figure, windowpane, and, intriguingly, flattery or deception. The shape meaning likely derives from a pre-Roman substrate word — possibly Gaulish or Iberian — *lausa, meaning flat stone or slab. This same root survives in Occitan lausa, Spanish losa (flagstone), and various place names across southern France.
The connection between flat stones and diamond shapes is straightforward: thin slabs of stone naturally fracture along crystalline axes that can produce rhomboid or diamond shapes. Medieval tilers and masons working with such stones would have been familiar with the lozenge as a natural geometric form.
The heraldic lozenge has a distinctive social meaning that has persisted for centuries. Since the 14th century, a convention developed in European heraldry whereby women's coats of arms were displayed on lozenge-shaped fields rather than on the shield shape used for men. The reasoning was that women did not bear arms in battle and therefore had no claim to the shield. This convention, while increasingly challenged, still appears in formal heraldic practice.
The medicinal use of the term emerged in the 16th century, when apothecaries began pressing medicines into small diamond-shaped tablets. The shape was practical — it was easy to mold and comfortable to hold in the mouth — but the terminology was borrowed directly from the geometric shape. Over time, medicinal lozenges lost their strict diamond form, but the name persisted even as the shapes became round or oval.
The Old French meaning of losenge as flattery remains etymologically mysterious. Some scholars have suggested a connection to the idea of a smooth, polished surface — flattery as verbal polishing. Others see a link to window glass (another meaning of losenge), with flattery conceived as transparent deception. Whatever the connection, Dante used the Italian cognate losinga in the Inferno to describe the sin of flattery, placing flatterers in the eighth circle of Hell.