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

Carbamic \Car*bam"ic\ (k[aum]r*b[a^]m"[i^]k), a. [Carbon +
   amido.] (Chem.)
   Pertaining to an acid so called.

   {Carbamic acid} (Chem.), an amido acid, {NH2.CO2H}, not
      existing in the free state, but occurring as a salt of
      ammonium in commercial ammonium carbonate; -- called also
      {amido formic acid}.

资料来源 : WordNet®

carbamic acid
     n : an acid that is known only by virtue of its salts (as
         ammonium carbamate) or its esters (as urethane)