noun Pharmacology.
a pharmacologically inert, adhesive substance, as honey, syrup, or gum arabic, used to bind the contents of a pill or tablet.

1720–30; < Latin excipient- (stem of excipiēns), present participle of excipere to take out, except, take up, equivalent to ex- ex-1 + -cipi- (stem of combining form of capere to take) + -ent- -ent

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World English Dictionary
excipient (ɪkˈsɪpɪənt)
a substance, such as sugar or gum, used to prepare a drug or drugs in a form suitable for administration
[C18: from Latin excipiēns excepting, from excipere to except]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

excipient ex·cip·i·ent (ĭk-sĭp'ē-ənt)
An inert substance used as a diluent or vehicle for a drug.

The American Heritage® Stedman's Medical Dictionary
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