Source: The Collaborative International Dictionary of English v.0.48
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 Xa, An, Y2. See Suffix, n., 2, and Subindex.
[1913 Webster]
Source: The Collaborative International Dictionary of English v.0.48
Subscript \Sub"script\, n.
Anything written below. --Bentley.
[1913 Webster]