demilance

from The Century Dictionary.

• noun A short and light spear introduced in the sixteenth century.
• noun A lightly armed horseman, especially one armed with a demi-lance.
• noun The armor worn by such a horseman, consisting of open helmet, breast- and back-pieces, usually fitted with pauldrons, tassets, and, rarely, brassarts or demi-brassarts.
• noun Also formerly dimilance.

from the GNU version of the Collaborative International Dictionary of English.

• noun A light lance; a short spear; a half pike; also, a demilancer.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A light lance; a short spear.
• noun One who carries a demilance; a demilancer.