The term 'CEILING BEAM' is composed of two words, 'CEILING' and 'BEAM'. The first word, 'CEILING', refers to the uppermost part of a room or other enclosed space. The second word, 'BEAM', is a long, thick piece of wood or metal used to support a structure. The crossword solution for this term is 'RAFTER', which is a sloping BEAM that supports the roof of a building. A RAFTER is typically made of wood and is connected to the CEILING BEAM in order to provide additional support.