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Abbreviation for gutta.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
gutta(gŭt′ă) [L., a drop],
(pl. gtt.) A drop. The amount in a drop varies with the nature of the liquid and its temperature. It is therefore not advisable to use the number of drops per minute of a solution as anything more than a general guide to the amount of material being administered intravenously.
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