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1 lb wt. = 5,521.60 gtt
1 gtt = 0.00018 lb wt.
Definition of pounds of water provided by Merriam-Webster
any of various units of mass and weight; specifically : a unit now in general use among English-speaking peoples equal to 16 avoirdupois ounces or 7000 grains or 0.4536 kilogram
Definition of US water drop of water provided by WikiPedia
The drop is a 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. The volume of a drop is not well-defined: it depends on the device and technique used to produce the drop, on the strength of the gravitational field, and on the density and the surface tension of the liquid