/ · 1894 Brewer’s · Q · Q.P
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Quantum placet. Two letters used in prescriptions, meaning the quantity may be as little or much as you like. Thus, in a cup of tea we might say “Milk and sugar q.p.”
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.
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