asphalt UK /ˈæsfælt/US /ˈæʃfɑlt/noun 2verb 1forms 3phrases 1 noun2 •A sticky, black to brown and highly viscous liquid or semi-solid, composed almost entirely of bitumen with small mineral particles, that is present in most crude petroleums and in some natural deposits.The mining of asphalt was big business in this area in the early twentieth century. •Ellipsis of asphalt concrete, a hard ground covering used for roads and walkways.Please hose off the asphalt near the top of the driveway if the trucks get lots of mud on it. verb1 •To pave with asphalt. formsasphalted · asphalting · asphalts Phrases with asphalt asphalt jungleA city or urban area, where the landscape is covered by pavement and the environment is alienating and unsafe.