Written below or underneath; as, iota subscript.
(Science: mathematics) (See iota) Specifically, said of marks, figures, or letters (suffixes), written below and usually to the right of other letters to distinguish them; as, a, n, 2, in the symbols Xa, An, Y2. See Suffix, 2, and subindex.
Origin: L. Subscriptus, p.p. See Subscribe.