The Collaborative International Dictionary of English v.0.48:
Span \Span\, v. t. [imp. & p. p. Spanned; p. pr. & vb. n.
Spanning.] [AS. pannan; akin to D. & G. spannen, OHG.
spannan, Sw. sp[aum]nna, Dan. spaende, Icel. spenna, and
perh. to Gr. ? to draw, to drag, L. spatium space. [root]170.
Cf. Spin, v. t., Space, Spasm.]
1. To measure by the span of the hand with the fingers
extended, or with the fingers encompassing the object; as,
to span a space or distance; to span a cylinder.
My right hand hath spanned the heavens. --Isa.
2. To reach from one side of to the order; to stretch over as
The rivers were spanned by arches of solid masonry.
3. To fetter, as a horse; to hobble.