Aliquot

Definition
adjective
Of, relating to or denoting an exact factor or divisor of a quantity, i.e. not resulting in a remainder, e.g. an aliquot part of 8 is 2.
noun
(mathematics) An aliquot part; a portion of a whole.
(chemistry) A sample or a portion of the total amount of a solution.
(pharmacology) A method of measuring ingredient below the sensitivity of a scale.
Supplement
In chemistry and pharmacology, it is common that a solution of a reagent is divided into aliquots so that there is no need in handling the total sample when a small portion is only needed.
Word origin: from the Latin aliquoties, “several times”
Compare: aliquant