Final answer:
The word 'lucid' in the given sentence refers to moments of clarity or clear thinking.
Step-by-step explanation:
The word 'lucid', as used in the sentence 'He has a few lucid moments every now and then', refers to moments of clarity or clear thinking. In this context, it suggests that the person typically has moments where their thoughts and actions are rational and coherent, even though it may not happen frequently. These lucid moments could be contrasted with other times when the person may feel confused or disoriented.