basilic: adjective, Arabic al-basilik = inner; the basilic vein is on the inner side of the forearm and arm. Previously thought to be of Greek origin, basilikos = royal (king-sized).
biceps: Latin bis = double, and caput = head, hence 2-headed, adjective - bicipital.
bifid: adjective, Latin bis = double, and findo = to split.
bifurcate: Latin bis = double, and furco = fork, hence to divide into two.
bilateral: Latin bi = two, lateral = side, hence, pertaining to two (both) sides.
bipennate: adjective, Latin bis = double, and pinna = feather, hence converging from 2 sides.
bregma: from a Greek word implying moist, referring to the site of the anterior fontanelle (q.v.), a little fountain, the site of junction of the coronal and sagittal sutures, where the brain can be felt pulsating in infancy.