Webster's Revised Unabridged Dictionary · 1913

Tret

Tret , third person singular present

third person singular present of Tread, for treadeth. [obsolete] — Chaucer

Tret , noun

[French traite a drawing, trading, journey, tax on wares in transit, anything diminishing the value of coins, from Old French traire to draw, Latin trahere. See Trait.]

(Commerce) An allowance to purchasers, for waste or refuse matter, of four pounds on every 104 pounds of suttle weight, or weight after the tare deducted. — M'Culloch