Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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stem1 the main axis of a plant, usu. above ground, from which branches, leaves, flowers, or fruits may arise. [9 definitions]
stem2 to stop the flow of; dam up; stanch. [5 definitions]
stem3 an upright, usu. curved beam at the bow of a nautical vessel, into which the side timbers are jointed. [2 definitions]