Entry 1 sense Webster, 1913 Seedling /sēd'-lĭng/ · Seed·ling · IPA /ˈsiːdlɪŋ/ 01 n. A plant reared from the seed, as distinguished from one propagated by layers, buds, or the like. 1. A plant reared from the seed, as distinguished from one propagated by layers, buds, or the like.(Bot.)