Etymology
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blacktop (n.)

road resurfacing material, 1931, American English, from black (adj.) + top (n.1).

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Definitions of blacktop
1
blacktop (v.)
coat with blacktop;
blacktop the driveway
2
blacktop (n.)
a black bituminous material used for paving roads or other areas; usually spread over crushed rock;
Synonyms: blacktopping
From wordnet.princeton.edu