thun·der (thŭn'dər)
n.

1. The crashing or booming sound produced by rapidly expanding air along the path of the electrical discharge of lightning.
2. A sound that resembles or suggests thunder.

v., -dered, -der·ing, -ders.

v.intr.

1. To produce thunder.
2. To produce sounds like thunder.
3. To utter loud, vociferous remarks or threats.

v.tr.
To express violently, commandingly, or angrily; roar.

[Middle English, from Old English thunor.]

thunderer thun'der·er n.

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The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.

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