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The drop is an approximated unit of measure of volume, the amount dispensed as one drop from a dropper or drip chamber. It is often used in giving quantities of liquid drugs to patients, and occasionally in cooking.
Traditional unit of piled firewood sold by volume. It typically measures a 4 x 1 x 4 foot stack and equals one-eights of a cord, 16 cubic feet, or 0.45 cubic meters.