1911 Encyclopædia Britannica/Bias
BIAS (from the Fr. biais, of unknown origin; the derivation from Lat. bifax, two-faced, is wrong), something oblique or slanting. The term is used especially of a piece of cloth cut obliquely across the texture, or of a seam of two such pieces brought together; and in the game of bowls (q.v.) it is applied alike to the one-sided construction of the bowl, flattened on one side and protruding on the other, and to the slanting line the bowl takes when thrown. The figurative sense of the word, prejudice or undue leaning to one side of a subject, is derived from this bowling term.