Diatomaceous earth is not poisonous; it does not have to be eaten in order to be effective. Diatomaceous earth causes insects to dry out and die by absorbing the oils and fats from the cuticle of the insect's exoskeleton.
Pace, plod, trudge refer to a steady and monotonous kind of walking. Pace suggests steady, measured steps as of one completely lost in thought or impelled by some distraction: to pace up and down. Plod implies a slow, heavy, laborious, weary walk: The mailman plods his weary way.
Roman pace - an ancient Roman unit of length (4.85 English feet) measured as the distance from the heel of one foot to the heel of the same foot when next it touches the ground. linear measure, linear unit - a unit of measurement of length.