rootlet n small root or division of a root Usage(s) It suits Tryon to imagine a great green heart beating slowly beneath the earth, with every rootlet and capillary in the village pulsing to it. A seed does not normally germinate until the rootlet of a suitable plant creeps close to it through the soil. Savaron, cursing brilliantly, burrowed down through the loams of illusion to the last dark rootlet of which words can tell.