Webster's Revised Unabridged Dictionary · 1913

Tare

Tare , imperfect

Tore. [obsolete]

Tare , noun

[Compare Prov. English tare brisk, eager, Old English tarefitch the wild vetch.]

1.
A weed that grows among wheat and other grain; -- alleged by modern naturalists to be the Lolium temulentum, or darnel.
Didst not thou sow good seed in thy field? From whence then hath it tares? — Matt. xiii. 27
The “darnel” is said to be the tares of Scripture, and is the only deleterious species belonging to the whole order. — Baird
2.
(Botany) A name of several climbing or diffuse leguminous herbs of the genus Vicia; especially, the Vicia sativa, sometimes grown for fodder.

Tare , noun

[French tare; compare Pr., Sp., Portuguese, & Italian tara; all from Arabic tarah thrown away, removed, from taraha to reject, remove.]

(Commerce) Deficiency in the weight or quantity of goods by reason of the weight of the cask, bag, or whatever contains the commodity, and is weighed with it; hence, the allowance or abatement of a certain weight or quantity which the seller makes to the buyer on account of the weight of such cask, bag, etc.

Tare , transitive verb

To ascertain or mark the tare of (goods).