(construction) A rigid board insulation generally composed of perlite or wood fiberboard factory bonded to polyisocyanurate or polystyrene.

(obsolete, nautical) To act in an unusual manner; to behave differently.

plural of bulletin board system

Synonym of spine board

Synonym of bulletin board system

A residential school which provides therapy and education.

plural of bulletin board service

plural of therapeutic boarding school

A school that provides board and lodging to some students, but allows others to attend during the day only, like a day school.

A government body responsible for investigations into transportation accidents to determine their cause and recommend courses of action to prevent or mitigate future similar incidents