13-Letter Words Containing: H,E,R,E,O,N,_

• a mildly narcotic analgesic drug (trade name Darvon) related to methadone but less addictive

• a colorless volatile flammable liquid with an almond odor that is made from chlorine and benzene; used as a solvent and in the production of phenol and DDT and other organic compounds

• a polyhedron whose faces are trapeziums

• a check that restrains another check

• something that checks the correctness of a previous check

• oppose or check by a counteraction

• check a second time

• an automotive system for shifting gears in which the gears revolve at the same speed and so shift smoothly

• including all or everything

• an intensive examination testing a student's proficiency in some special field of knowledge

• broad in scope

• someone who organizes an exhibit for others to see