资料来源 : pyDict

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资料来源 : Webster's Revised Unabridged Dictionary (1913)

Sub- \Sub-\ [L. sub under, below; akin to Gr. ?, Skr. upa to,
   on, under, over. Cf. {Hypo-}, {Super-}.]
   1. A prefix signifying under, below, beneath, and hence
      often, in an inferior position or degree, in an imperfect
      or partial state, as in subscribe, substruct, subserve,
      subject, subordinate, subacid, subastringent, subgranular,
      suborn. Sub- in Latin compounds often becomes sum- before
      m, sur before r, and regularly becomes suc-, suf-, sug-,
      and sup- before c, f, g, and p respectively. Before c, p,
      and t it sometimes takes form sus- (by the dropping of b
      from a collateral form, subs-).

   2. (Chem.) A prefix denoting that the ingredient (of a
      compound) signified by the term to which it is prefixed,is
      present in only a small proportion, or less than the
      normal amount; as, subsulphide, suboxide, etc. Prefixed to
      the name of a salt it is equivalent to basic; as,
      subacetate or basic acetate. [Obsoles.]