Subindex

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Subindex \Sub*in"dex\, n.; pl. {Subindices}. (Math.)
     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.
     [1913 Webster]