A liquid substance that is to be distilled or is being distilled; the raw material undergoing distillation.
From distill + -and (suffix denoting the object of an action, from Latin gerundive forms). Similar to words like 'multiplicand' or 'subtrahend' in mathematics.
This technical term appears mainly in chemistry and industrial texts—it's one of those professional jargon words that precisely names something for which we'd otherwise need several words.
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