Definition of "Stem" :

noun: a turn made in skiing; the back of one ski is forced outward and the other ski is brought parallel to it

noun: front part of a vessel or aircraft

noun: cylinder forming a long narrow part of something

noun: the tube of a tobacco pipe

noun: (linguistics) the form of a word after all affixes are removed

"Thematic vowels are part of the stem."

noun: a slender or elongated structure that supports a plant or fungus or a plant part or plant organ

verb: remove the stem from

"For automatic natural language processing, the words must be stemmed."

verb: stop the flow of a liquid

"Stem the tide."

verb: grow out of, have roots in, originate in

"The increase in the national debt stems from the last war."

verb: cause to point inward

"Stem your skis."