Word of the day · 19 August 2026

lucid

/ˈluːsɪd/

adjective

Clear and easy to understand; also mentally clear.

In a sentence

His lucid explainer helped beginners finish the setup.
After the fever broke she had a few lucid hours with her family.
Keep the instructions lucid; jargon only slows the reader.

In an image

Clear water over stones beside a simple sand sketch — Illustrative: see-through water and a simple sketch stand for thought that is clear and easy to follow.

Origin

From Latin lucidus (bright, clear), from lucere (to shine).

History

Lucid entered English for brightness and for clear expression. Medicine and psychology later used lucid intervals for periods of mental clarity during illness. Dream research popularized lucid dreaming for awareness inside a dream. Across these uses the core idea stays the same: light where confusion was.

Nearby words

clear · intelligible · pellucid

Clarity in thought, prose and waking mind.

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