Dictionary Definition:
Byāma [cp. Vedic & P. vyāma cp. Śatap. Br. i.2, 5, 14 a fathom, measured by both hands being extended to their full length, only in phrase ˚ppabhā a halo extending for a fathom around the Buddha J i.12, 90; Bu i.45; Miln 75; VvA 213.