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Glossary

flame spread

Flaming combustion along a surface (not to be confused with the transfer of flame by air currents).

Glossary

flap trap

In plumbing, a trap having a hinged flap which allows flow in one direction only, preventing backflow.

Glossary

flap door

A small door, hinged horizontally along the bottom, that opens downward.

Glossary

flank wall

A sidewall of a building in contrast to the front or rear wall.

Glossary

flanker

1. A dependency or a service wing on a side of a building. 2. From a recess in the side

Glossary

flanked

Said of a fortification that is defended by another fortification.

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