a combining form meaning “moss, liverwort,” used in the formation of compound words: bryology.
Origin of bryo-
combining form representing Greek brýon moss
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
word-forming element meaning "moss" in scientific compounds, from Greek bryos, bryon "moss."
Online Etymology Dictionary, © 2010 Douglas Harper