stem

cylinder forming a long narrow part of something

the tube of a tobacco pipe

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

stop the flow of a liquid

“stem the tide”

the form of a word after all affixes are removed

“thematic vowels are part of the stem”

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

front part of a vessel or aircraft

cause to point inward

“stem your skis”

grow out of, have roots in, originate in

“The increase in the national debt stems from the last war”

remove the stem from

“for automatic natural language processing, the words must be stemmed”