Hypertext Webster Gateway: "summertree"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Summer \Sum"mer\, n. [F. sommier a rafter, the same word as
sommier a beast of burden. See {Sumpter}.] (Arch.)
A large stone or beam placed horizontally on columns, piers,
posts, or the like, serving for various uses. Specifically:
(a) The lintel of a door or window.
(b) The commencement of a cross vault.
(c) A central floor timber, as a girder, or a piece reaching
from a wall to a girder. Called also {summertree}.
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Summertree \Sum"mer*tree`\, n. [Summer a beam + tree.] (Arch.)
A summer. See 2d {Summer}.
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