• Webster's Revised Unabridged Dictionary
    • n Tiebeam (Arch) A beam acting as a tie, as at the bottom of a pair of principal rafters, to prevent them from thrusting out the wall. See Illust. of Timbers, under Roof.
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In literature:

Apparently one end of a tiebeam rested on the circular column and the other end was embedded in the main wall.
"Inca Land" by Hiram Bingham