Douglas fir

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Douglas fir:

see pinepine,
common name for members of the Pinaceae, a family of resinous woody trees with needlelike, usually evergreen leaves. The Pinaceae reproduce by means of cones (see cone) rather than flowers and many have winged seeds, suitable for wind distribution.
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Douglas fir

A strong, medium-density, medium-textured softwood; widely used for plywood and lumber in construction.


Wood of a number of tropical species, usually distinguished by its dark color, durability, and hardness; used for carving and ornamental cabinetwork.


A tough, strong, moderately high-density hardwood of brown color; often has a twisted interlocked grain; used for decorative veneer, piles, and planks.A softwood of the temperate climates including Douglas fir, white fir, silver fir, and balsam fir; used for framing and interior trim.

folded plate

A thin skin of plywood reinforced by purlins to form tructures of great strength.

glue-laminated arch

An arch made from layers of wood that are joined with adhesives. The glued joints transmit the shear stresses, so the structure acts as one piece capable for use in structural arches and long-span beams.


A moderately high-density hardwood, whitish to gray-green in color and of uniform texture; used for low-grade veneer, plywood, and rough cabinet work.


A dense smooth-surfaced composition board composed of highly compressed fibers; one such type is called Masonite®.


Timber from all trees except the conifers, which are called softwood.


The center portion of a tree trunk that is no longer growing or carrying the sap; often harder and denser.


Wood of a coniferous tree; moisture-resistant, soft, coarse, and uneven-textured; it splinters easily and is inferior for construction use.


A tough, hard, strong wood; has high shock resistance and high bending strength.

laminated timber

Timber beam or arch manufactured from four or more layers of wood, usually about 1 inch thick, bonded together with waterproof adhesive.


A fine-textured, strong, hard, straight-grained wood of a coniferous tree; heavier than most softwoods.


Narrow strips of wood that serve as a base for plaster, usually nailed to studs in walls or rafters in ceilings.


A straight-grained, fine-textured wood used for interior paneling.


Wood of the locust tree; coarse-grained, strong, hard, decay-resistant, and durable.


A straight-grained wood of intermediate density, pinkish to red-brown in color; used primarily for interior cabinetwork and decorative paneling.


A hard, tough, moderately high-density wood, light to dark brown in color, with a uniform texture; used for flooring and wood trim.

Douglas Fir


(Pseudotsuga menziesii’, better known by the incorrect name P. taxifolia), an evergreen coniferous tree of the family Pinaceae, named for the Scottish botanist D. Douglas (1798-1834). The trees grow 50-75 (100) m tall and 1.2 to 2 (4) m in diameter. The crown is cone-shaped. The needles are flat and stand out in all directions. The female cones are 7 to 10 cm long with rounded seed scales; the covering scales are narrow with a bifurcated tip and a well-developed central vein that extends in an awl-like fashion above the lobes. The tree suffers (and sometimes dies) from spring and autumn frosts and prolonged drought, but it is relatively tolerant of various types of soil. The Douglas fir begins to bear cones after ten to 25 years and can live up to 500 years. It grows wild along the Pacific coast of North America. In the USSR it is found in gardens and parks of the Caucasus and in the southern Ukraine. The wood is used in buildings, ships, furniture, and railroad cars. The bark contains tannins.


Douglas fir, Oregon pine, red fir, yellow fir

A strong, medium-density, medium- to coarse-textured softwood; widely used for plywood and as lumber and timber in construction work.