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Webster’s Dictionary (1828)

98,828 entries. Headwords are matched first, then definition text.

2 words match “SUBINDEX”

SUBINDEX n.
A number or mark placed opposite the lower part of a letter or symbol to distinguish the symbol; thus, a0, b1, c2, xn, have 0, 1, 2, and n as subindices.
SUBSCRIPT a.
tters to distinguish them; as, a, n, 2, in the symbols Xa, An, Y2. See Suffix, n., 2, and Subindex.