THE WOOD GLOSSARY




Wood terms beginning with:

A B C D E F G H IJK L M N O PQ R S T UV W XYZ


Radial - Coincident with a radius from the axis of the tree or log to the circumference: in a round timber or piece of lumber, a line or surface extending outward from the heart-center: a radial surface is always edge-grain.

Radial section - A lengthwise section in a plane that passes through the centerline of the tree trunk.

Radial shrinkage - Shrinkage in a piece of lumber that occurs across the growth rings as it begins to dry.

Ray - (1) Strips of cells extending radially within a tree and varying in height from a few cells in some species to 4 or more inches in oak. The rays serve primarily to store food and transport it horizontally in the tree. On quartersawed oak, the rays form a conspicuous figure, sometimes referred to as flecks. (2) A ribbon like figure caused by the strands of cells which extend across the grain in quarter-sawn lumber.

Reaction wood - (1) Abnormal wood tissue that was formed in a leaning tree. Reaction wood is very unstable and prone to warping and cupping when sawn into lumber. (2) Wood with more or less distinctive anatomical characters, formed typically in parts of leaning and crooked stems and in branches. In hardwoods this consists of tension wood and in softwoods of compression wood.

Relative humidity - The amount of moisture in the air is measured as a percentage of the total amount of moisture the air can hold at a particular temperature. This is known as relative humidity. The ideal relative humidity for a home is between 35% and 45%, too much above or below these levels problems can begin to occur.

Resaw - A board split in half from a thicker board.

Ripcut (ripping) - A cut made parallel to the grain of a board.

Rotary-cut veneer - Veneer which was cut from a log in one long sheet. Rotary cut veneer is cut from a log like a roll of paper towels.

Rough-sawn - (1) Lumber that is either green or dried that has not been dressed. (2) Lumber that has been sawn, edged, and trimmed, but not surfaced.



The Wood Glossary






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