nutriment (n.)

"food, drink, sustenance," early 15c., from Latin nutrimentum "nourishment; support," from nutrire "to nourish, suckle, feed," from PIE *nu-tri-, suffixed form (with feminine agent suffix) of *(s)nau- "to swim, flow, let flow," hence "to suckle," extended form of root *sna- "to swim."