baize (n.) Look up baize at Dictionary.com
coarse woolen fabric with a nap on one side, dyed in plain colors, 1570s, bayse, from French baies, fem. plural of adjective bai "bay-colored" (12c.), from Latin badius "chestnut-colored" (see bay (n.4)). Thus probably so called for its original color. French plural taken as a singular in English.