A MS written in small, cursive letters, not capitals. The style became normal from the 10th cent. CE; there are a large number of such MSS of the NT.
Citation for minuscule
Citation styles are based on the Chicago Manual of Style, 15th Ed., and the MLA Style Manual, 2nd Ed..
MLA
"minuscule." In A Dictionary of the Bible. Ed. W. R. F. Browning. Oxford Biblical Studies Online. Jun 18, 2013. <http://www.oxfordbiblicalcstudies.com/article/opr/t94/e1265>.
Chicago
"minuscule." In A Dictionary of the Bible. , edited by W. R. F. Browning. Oxford Biblical Studies Online, http://www.oxfordbiblicalcstudies.com/article/opr/t94/e1265 (accessed Jun 18, 2013).