noun1.  Also called: cornet à pistons (ˈkɔːnɪt ə ˈpɪstənz,  French kɔrnɛ a pistɔ̃) a three-valved brass instrument of the trumpet family. Written range: about two and a half octaves upwards from E below middle C. It is a transposing instrument in B flat or A
 2. a person who plays the cornet
 3.   a variant spelling of cornett
4. a cone-shaped paper container for sweets, etc
 5.  British a cone-shaped wafer container for ice cream
  6. (formerly) the lowest rank of commissioned cavalry officer in the British army
 7.  South Africa  short for field cornet
8. a starched and wired muslin or lace cap worn by women from the 12th to the 15th centuries
 9. the large white headdress of some nuns
  Word origin
C14: from Old French, from 
corn, from Latin 
cornū horn