Entry 2 senses Webster, 1913 Kex · IPA /kɛks/ 01 n. A weed; a kecksy. 1. A weed; a kecksy.(Bot.) “Though the rough kex break The starred mosaic.” — Tennyson. 2. A dry husk or covering. “When the kex, or husk, is broken, he proveth a fair flying butterfly.” — Holland.