Hydrocarbon, any of a class of organic chemical compounds composed only of the elements carbon (C) and hydrogen (H). The carbon atoms join together to form the framework of the compound; the hydrogen atoms attach to them in many different configurations. Hydrocarbons are the principal constituents of petroleum and natural gas.
Use slab in a sentence. 1  a piece that is flat, broad, and fairly thick: a slab of concrete, a slab of bread.  any of the rough, outer pieces cut from a log, as in sawing it into lumber.
slab (plural slabs) (Southern US, slang) A car that has been modified with equipment such as loudspeakers, lights, special paint, hydraulics, and any other accessories that add to the style of the vehicle. quotations â¼ Slim thug - wood grain wheel - You ain't riding slab if them ain't swangas on ya ride.