Answer: boustrophedon

AnswerCrossword Clue
boustrophedon(Greek) a method of writing in which lines are written alternately in opposite direction, from left to right, and right to left
boustrophedonan ancient method of writing in which the lines run alternately from right to left and from left to right.
boustrophedon(of written words) From right to left and from left to right in alternate lines