The Collaborative International Dictionary of English v.0.48:

Majuscule \Ma*jus"cule\, n. [Cf. F. majuscule. See
   Majusculae.]
   A capital letter; especially, one used in ancient
   manuscripts. See Majusculae.
   [1913 Webster]

   Majuscule writing, writing composed wholly of capital
      letters, especially the style which prevailed in Europe
      from the third to the sixth century.
      [1913 Webster]