Stalk/stɔːk/ Definition 1 of 5Pro Tip 1/3Part of Plant Used to describe the main support of a plant, less common for trees. She carefully measured the stalk of the sunflower. Pro Tip 2/3Physical Strength Implies that the plant can support weight, like a flower's head. The stalk seemed strong enough to hold the heavy bloom. Pro Tip 3/3Edibility Context It sometimes refers to a part that can be eaten, as with celery. Chop the celery stalk into small pieces for the salad.