adj

pineal

PIH-neerl

adj

Relating to the pineal gland, a small pinecone-shaped gland in the brain that produces melatonin.

"The pineal gland helps regulate our sleep cycle."

"Doctors scanned the pineal region for abnormalities."

How to Use Pineal

Learner’s notes

In plain EnglishDescribing the tiny brain gland shaped like a pine cone that controls your sleep-wake rhythm.

Memory tip

You will almost always see this word paired with "gland."

Trace the full origin ↓

Common pairings

pineal gland

more pineal comparative, pineals plural, most pineal superlative

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Test yourself on “pineal” A quick quiz — meaning, synonyms & usage →

Can you complete this real example?

The _____ gland helps regulate our sleep cycle.

From Latin pinea, "pine cone" — the gland is named for its small cone-like shape.

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