The Collaborative International Dictionary of English v.0.48:

Majusculae \Ma*jus"cu*lae\, n. pl. [L., fem. pl. fr. majusculus
   somewhat greater or great, dim. of major, majus. See
   Major.] (Palaeography)
   Capital letters, as found in manuscripts of the sixth century
   and earlier.
   [1913 Webster]