drop

drop
   1. (gtt)
   a unit of volume used in pharmacy. Traditionally the drop was another name for a minim, a unit of volume equal to 1/60 fluid dram or 1/480 fluid ounce (about 0.0616 milliliter in the U.S., 0.0592 milliliter in Britain).
   Now that prescriptions are written in metric units, the pharmacist's drop is equal to exactly 0.05 milliliter (20 drops/ml). In hospitals, intravenous tubing is used to deliver medication in drops of various sizes ranging from 10 drops/ml to 60 drops/ml. The traditional abbreviation is from the Latin gutta, drop. Originally, gt was the symbol for a single drop, with gtt being the plural.
   2. a informal unit of volume used in recipes. According to some older kitchen references, 24 drops = 1/4 teaspoon; with U.S. definitions this makes the drop equal to 1/576 fluid ounce or about 0.051 milliliter, comparable to the pharmacist's drop (previous entry).

Dictionary of units of measurement. 2015.

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