A sentence that teaches a new vocabulary word should always be pellucid, that is, its style and meaning should be easily understandable so that you can derive the definition from the sentence.

You may have heard the word lucid, which means clear. Both lucid and pellucid derive from a Latin word that means "to shine through." Pellucid water is clear, a pellucid sky is a particularly intense shade of blue, pellucid prose is writing that's easy to understand, and pellucid singing is clear and light in tone.

Definitions of pellucid

adj transmitting light; able to be seen through with clarity

“a pellucid brook”
crystal clear, crystalline, limpid, lucid, transparent
allowing light to pass through

adj (of language) transparently clear; easily understandable

pellucid prose”
crystal clear, limpid, lucid, luculent, perspicuous
readily apparent to the mind

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