bry·ol·o·gy \-jē\noun (-es) Etymology: International Scientific Vocabulary bry- + -logy 1. a.obsolete: the science of mosses b.: a branch of botany that deals with the bryophytes 2. a.: moss life (as of a region) < the bryology of Wales > b.: the properties and life phenomena exhibited by a moss or moss type < the bryology of sphagnum >