lu·cid / ˈloōsid/ • adj. 1. expressed clearly; easy to understand: a lucid account write in a clear and lucid style. ∎ showing ability to think clearly, esp. in the intervals between periods of confusion or insanity: he has a few lucid moments every now and then. ∎ Psychol. (of a dream) experienced with the dreamer feeling awake, aware of dreaming, and able to control events consciously. 2. poetic/lit. bright or luminous: birds dipped their wings in the lucid flow of air. DERIVATIVES: lu·cid·i·ty / loōˈsidətē/ n. lu·cid·ly adv. lu·cid·ness n.