Definitions
1.nounA vetch, or the seed of a vetch (genus Vicia, esp. Vicia sativa)
2.nounAny of the tufted grasses of genus Lolium; darnel.
3.nounA damaging weed growing in fields of grain.
4.nounThe empty weight of a container; the tare weight or unladen weight.
5.verbTo take into account the weight of the container, wrapping etc. in weighting merchandise.
6.verbTo set a zero value on an instrument (usually a balance) that discounts the starting point.