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Essential food or nutrients required to support or maintain life.
Medical Dictionary for the Dental Professions © Farlex 2012
References in classic literature ?
Very weak I was already; without sustenance I should surely die.
"Thou forgettest, however, Ben-Levi," replied Abel-Phittim, "that the Roman Pompey, who is now impiously besieging the city of the Most High, has no assurity that we apply not the lambs thus purchased for the altar, to the sustenance of the body, rather than of the spirit."
It is not the occasional member of its species that is a man hunter--all are man hunters; but they do not confine their foraging to man alone, for there is no flesh or fish within Pellucidar that they will not eat with relish in the constant efforts which they make to furnish their huge carcasses with sufficient sustenance to maintain their mighty thews.