Source : Webster's Revised Unabridged Dictionary (1913)

Scamillus \Sca*mil"lus\, n.; pl. {Scamilli}. [L., originally, a
   little bench, dim. of scamnum bench, stool.] (Arch.)
   A sort of second plinth or block, below the bases of Ionic
   and Corinthian columns, generally without moldings, and of
   smaller size horizontally than the pedestal.