Webster's Revised Unabridged Dictionary · 1913

Span

Span , imperfect and past participle

imp. & past participle of Spin. [archaic]

Span , noun

[Anglo-Saxon spann; akin to Dutch span, Old High German spanna, German spanne, Icelandic sponn. r170. See Span, transitive verb ]

1.
The space from the thumb to the end of the little finger when extended; nine inches; eighth of a fathom.
2.
Hence, a small space or a brief portion of time.
Yet not to earth's contracted span Thy goodness let me bound. — Pope
Life's but a span; I'll every inch enjoy. — Farquhar
3.
The spread or extent of an arch between its abutments, or of a beam, girder, truss, roof, bridge, or the like, between its supports.
4.
(Nautical) A rope having its ends made fast so that a purchase can be hooked to the bight; also, a rope made fast in the center so that both ends can be used.
5.
A pair of horses or other animals driven together; usually, such a pair of horses when similar in color, form, and action.
Collocations (5)
Span blocks (Nautical) , blocks at the topmast and topgallant-mast heads, for the studding-sail halyards.
Span counter , an old English child's game, in which one throws a counter on the ground, and another tries to hit it with his counter, or to get his counter so near it that he can span the space between them, and touch both the counters. — Shakespeare Henry V., in whose time boys went to span counter for French crowns. — Halliwell
Span iron (Nautical) , a special kind of harpoon, usually secured just below the gunwale of a whaleboat.
Span roof , a common roof, having two slopes and one ridge, with eaves on both sides. — Gwilt
Span shackle (Nautical) , a large bolt driven through the forecastle deck, with a triangular shackle in the head to receive the heel of the old-fashioned fish davit. — Ham. Nav. Encyc

Span , transitive verb

[Anglo-Saxon pannan; akin to Dutch & German spannen, Old High German spannan, Swedish spanna, Danish spaende, Icelandic spenna, and perh. to Greek {not transcribed} to draw, to drag, Latin spatium space. r170. Compare Spin, transitive verb, 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. xiviii. 13
2.
To reach from one side of to the order; to stretch over as an arch.
The rivers were spanned by arches of solid masonry. — prescott
3.
To fetter, as a horse; to hobble.

Span , intransitive verb

To be matched, as horses. [United States]