"stout pole," c.1300, "rafter," from M.L.G. or M.Du. sparre, from P.Gmc. *sparron (cf. O.E. *spere "spear, lance," O.N. sperra "rafter, beam"), from PIE base *sper- "spear, pole" (see
spear). Nautical use dates from 1640. Also borrowed in O.Fr. as esparre, which may have been