The Collaborative International Dictionary of English v.0.48:

Minuscule \Mi*nus"cule\, n. [L. minusculus rather small, fr.
   minus less: cf. F. minuscule.]
   [1913 Webster]
   1. Any very small, minute object.
      [1913 Webster]

   2. A small Roman letter which is neither capital nor uncial;
      a manuscript written in such letters.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

minuscule \minuscule\ adj. a.
   Of or relating to a minuscule[2] or of a script written in
   minuscules[2]; of the size and style of minuscules[2];
   written in minuscules[2]; minuscular.
   [1913 Webster + WordNet 1.5]

         These minuscule letters are cursive forms of the
         earlier uncials.                         --I. Taylor
                                                  (The
                                                  Alphabet).
   [1913 Webster]

WordNet (r) 3.0 (2006):

minuscule
    adj 1: of or relating to a small cursive script developed from
           uncial; 7th to 9th centuries [syn: minuscule,
           minuscular] [ant: majuscule]
    2: lowercase; "little a"; "small a"; "e.e.cummings's poetry is
       written all in minuscule letters" [syn: little,
       minuscule, small]
    3: very small; "a minuscule kitchen"; "a minuscule amount of
       rain fell" [syn: minuscule, miniscule]
    n 1: the characters that were once kept in bottom half of a
         compositor's type case [syn: small letter, lowercase,
         lower-case letter, minuscule] [ant: capital, capital
         letter, majuscule, upper-case letter, uppercase]
    2: a small cursive script developed from uncial between the 7th
       and 9th centuries and used in medieval manuscripts

Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "minuscule":
   abecedarian, allographic, alphabetic, baby, baby-sized, bantam,
   banty, capital, compact, diminutive, duodecimo, graphemic, handy,
   ideographic, lettered, lexigraphic, literal, logogrammatic,
   logographic, lower-case, majuscule, miniature, miniaturized,
   minikin, minimal, minuscular, pictographic, pocket, pocket-sized,
   pony, small-scale, subminiature, toy, transliterated, twelvemo,
   uncial, upper-case, vest-pocket