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) 1  A large, flat piece of solid material; a solid object that is large and flat. quotations â¼ 1859, John Lang, Botany Bay, or, True Tales of Early Australia, page 155, There were no windows in the inn. 2  A paving stone; a flagstone. ( 3 Australia) A carton containing twenty-four cans of beer.