Subscript \Sub"script\, a. [L. subscriptus, p. p. See
Subscribe.]
Written below or underneath; as, iota subscript. (See under
Iota.) Specifically (Math.), 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 X_a, A_n, Y_2. See Suffix, n., 2, and
Subindex.
Source: Webster's Revised Unabridged Dictionary (1913)
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