tie beam

n.
A horizontal beam forming the base of a triangular truss for a pitched roof, connecting the two side walls and supporting a pair of principals.

1. On individual pile caps or spread footings which are eccentrically loaded, a beam (usually of reinforced concrete) used to distribute horizontal forces to other pile caps or footings; a strap, 2.
2. In roof framing, a horizontal timber connecting two opposite rafters at their lower ends to prevent them from spreading; also see collar beam.

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The noun has one meaning:

Meaning #1: a horizontal beam used to prevent two other structural members from spreading apart or separating
  Synonym: tie

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