A medical abbreviation meaning 'drops,' used in prescriptions and medical instructions to indicate how many drops of liquid medicine should be taken.
From Latin 'gutta' meaning 'drop,' abbreviated as 'gtt' (plural 'guttae') in medical and pharmaceutical terminology, a convention established when Latin was the universal language of medicine.
Doctors still use Latin abbreviations like 'gtt' because it's a universal language that works whether you're in Tokyo or Toronto—no translation needed when prescribing medicine to a global medical community.
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