Etymology
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treacle (n.)

mid-14c., "medicinal compound, antidote for poison," from Old French triacle "antidote, cure for snake-bite" (c. 1200), from Vulgar Latin *triacula, from Latin theriaca, from Greek theriake (antidotos) "antidote for poisonous wild animals," from fem. of theriakos "of a wild animal," from therion "wild animal," diminutive of ther (genitive theros) "wild animal," from PIE root *ghwer- "wild beast."

Sense of "molasses" is first recorded 1690s (the connection may be from the use of molasses as a laxative, or its use to disguise the bad taste of medicine); that of "anything too sweet or sentimental" is from 1771. Related: Treacly.

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Definitions of treacle

treacle (n.)
a pale cane syrup;
Synonyms: golden syrup
treacle (n.)
writing or music that is excessively sweet and sentimental;
Synonyms: mush / slop / glop
From wordnet.princeton.edu