n. 沥青

[化] 沥青; 石油沥青

[医] 沥青

[ noun ]
any of various naturally occurring impure mixtures of hydrocarbons
<noun.substance>

Bitumen \Bi*tu"men\, n. [L. bitumen: cf. F. bitume. Cf.
{B['e]ton}.]
1. Mineral pitch; a black, tarry substance, burning with a
bright flame; Jew's pitch. It occurs as an abundant
natural product in many places, as on the shores of the
Dead and Caspian Seas. It is used in cements, in the
construction of pavements, etc. See {Asphalt}.

2. By extension, any one of the natural hydrocarbons,
including the hard, solid, brittle varieties called
asphalt, the semisolid maltha and mineral tars, the oily
petroleums, and even the light, volatile naphthas.