L. Fr. A hand. More commonly written “meyn.” —Main-a-main. Immediately. Kelham. MAIN. Principal, chief, most important in size, extent, or utility. —Main ehannel. The main channel of a river is that bed over which the principal volume of water flows. See St. Louis, etc., Packet Co. v. Keokuk & H. Bridge Co. (C. C.) 31