Entry 2 senses · 2 variants Webster, 1913 Bellflower /bĕl'-flouˌ-ẽr/ · Bell·flow·er · IPA /bˈɛlflˌaʊər/ n. n. 01 n. A plant of the genus Campanula; -- so named from its bell-shaped flowers. 1. A plant of the genus Campanula; -- so named from its bell-shaped flowers.(Bot.) 02 n. A kind of apple. The yellow bellflower is a large, yellow winter apple. 1. A kind of apple. The yellow bellflower is a large, yellow winter apple.