lozenge
US /ˈlɑː.zəndʒ/
UK /ˈlɑː.zəndʒ/

1.
a small medicinal tablet, originally diamond-shaped, taken for sore throats or coughs
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She sucked on a cough lozenge to soothe her throat.
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The doctor recommended antiseptic lozenges for the infection.
2.
a diamond or rhombic shape in heraldry or architecture
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The coat of arms featured a prominent lozenge.
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The building's facade was decorated with intricate lozenge patterns.