stemstem /stem/ noun 
► stem
► stem the long narrow part of a plant, that leaves or flowers grow on. You use stem especially to talk about the longest or main part that grows up from the ground: He gave her a dozen red roses on long stems. The flower was bending over because the stem had broken.
► stalk the narrow part of a plant, that grows from the stem or branch and that leaves, flowers, or fruit grow on: When you pick an apple off a tree, the stalk sometimes stays on the apple.
► trunk the thick wooden stem of a tree: Teresa sat under the tree and leaned against the trunk.