a small, flavored tablet made from sugar or syrup, often medicated, originally diamond-shaped.
Geometry Now Rare. diamond ( def 8 ).
a diamond-shaped charge.
a diamond-shaped shield bearing the arms of a woman.

1300–50; Middle English losenge < Middle French, Old French, perhaps < Gaulish *lausa flat stone + -enge < Germanic -inga -ing3

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World English Dictionary
lozenge (ˈlɒzɪndʒ)
1.  med pastille, Also called: troche a medicated tablet held in the mouth until it has dissolved
2.  geometry another name for rhombus
3.  heraldry a diamond-shaped charge
[C14: from Old French losange, of Gaulish origin; compare Vulgar Latin lausa flat stone]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1327, from O.Fr. losenge "windowpane, small square cake," etc., used for many flat quadrilateral things. Cognates in Sp. losanje, Catalan llosange, It. lozanga. Probably from a pre-Roman Celtic language, perhaps Iberian *lausa or Gaul. *lausa "flat stone" (cf. Prov. lausa, Sp. losa, Catalan llosa,
Port. lousa "slab, tombstone"), from a pre-Celtic language. Originally in Eng. a term in heraldry; meaning "small cake or tablet (originally diamond-shaped) of medicine and sugar, etc., meant to be held in the mouth and dissolved" is from 1530.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

lozenge loz·enge (lŏz'ĭnj)
A small, medicated candy intended to be dissolved slowly in the mouth to lubricate and soothe irritated tissues of the throat.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Zinc preparations in lozenge or nasal gel form are now available as cold treatments.
Patients receive one lozenge orally of capsaicin or placebo four times daily.
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