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PLAC'ID, adjective [Latin placidus, from placo, to appease.]

1. Gentle; quiet; undisturbed; equable; as a placid motion of the spirits.

2. Serene; mild; unruffled; indicating peace of mind; as a placid countenance or smile.

3. Calm; tranquil; serene; not stormy; as a placid sky.

4. Calm; quiet; unruffled; as a placid stream.