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W

Water potential

the tendency of a solution to lose water molecules

Weaning

the act of separating the young from their nursing mother, as they become dependant on other foodstuffs for their nourishment

Withdrawal period

the set time that must pass, after giving a medicine to a food-producing animal, before it can be slaughtered for meat or its products used for human food

Wool hair

the fine soft hairs that make up the undercoat