Webster's Revised Unabridged Dictionary · 1913

Lumber

Lumber , noun

[Probably from Lombard, the Lombards being the money lenders and pawnbrokers of the Middle Ages. A lumber room was, according to Trench, originally a Lombard room, or room where the Lombard pawnbroker stored his pledges. See Lombard.]

1.
A pawnbroker's shop, or room for storing articles put in pawn; hence, a pledge, or pawn. [Obsolete]
They put all the little plate they had in the lumber, which is pawning it, till the ships came. — Lady Murray
2.
Old or refuse household stuff; things cumbrous, or bulky and useless, or of small value.
3.
Timber sawed or split into the form of beams, joists, boards, planks, staves, hoops, etc.; esp., that which is smaller than heavy timber. [United States]
Collocations (4)
Lumber kiln , a room in which timber or lumber is dried by artificial heat. [United States]
Lumber room , a room in which unused furniture or other lumber is kept. [United States]
Lumber wagon , a heavy rough wagon, without springs, used for general farmwork, etc.
dimensional lumber , lumber, usually of pine, which is sold as beams or planks having a specified nominal cross-section, usually in inches, such a two-by-four, two-by-six, four-by-four, etc.

Lumber , transitive verb

1.
To heap together in disorder.
Stuff lumbered together. — Rymer
2.
To fill or encumber with lumber; as, to lumber up a room.

Lumber , intransitive verb

1.
To move heavily, as if burdened.
2.
To make a sound as if moving heavily or clumsily; to rumble. — Cowper
3.
To cut logs in the forest, or prepare timber for market. [United States]