tar-macadam

noun

a paving material consisting of coarse crushed stone covered with a mixture of tar and bitumen.

Origin:
1880–85; tar¹ + macadam

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet

tarmacadam
noun
1.	a paving material of tar and broken stone; mixed in a factory and shaped during paving
2.	a paved surface having compressed layers of broken rocks held together with tar

WordNet® 3.0, © 2006 by Princeton University.
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00:10

Tar-macadam is always a great word to know.

So is flibbertigibbet. Does it mean:

a chattering or flighty, light-headed person.

a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.

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tar·mac·ad·am