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subindex n. 分指數 分指數 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]
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