haz·ard (hăz′ərd) n. 1. a. A chance of being injured or harmed: Space travel is full of hazards. b. Risk or danger: a high degree of hazard. 2. A possible source of danger: This room is a fire hazard. 3. Games A game played with dice that is a forerunner of craps and was especially popular in England in the 1600s and 1700s. 4. Sports An obstacle …