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


Girth - The distance around a tree; the circumference.

Grade - The designation of the quality of wood; applied to lumber, plywood, logs, etc.

Grading rules - A set of criteria by which to judge various pieces of lumber or panels in terms of strength, appearance, and suitability for various uses. Regional grading agencies draw up rules for grading based on the voluntary product standards issued by the U.S. Bureau of Standards.

Grain - The direction, size, arrangement, appearance or quality of the fibers in wood. Among the many types of grain are fine, coarse, straight, curly, open, flat, vertical, and spiral.

Green lumber - (1) Freshly cut lumber that has not had time to dry. Lumber that is above 30% moisture content. (2) An alternate definition: lumber with a moisture content of 19% or more.

Green wood - Unseasoned wood (freshly sawn or unseasoned wood). Wood that has become completely wet after immersion in water would not be considered green, but may be said to be in the "green condition."

Growth ring - The layer of wood growth put on a tree during a single growing season. The annual growth rings of many species (e.g., oaks and pines) are readily distinguished because of differences in the cells formed during the early and late parts of the season. In some temperate zone species (black gum and sweetgum) and many tropical species, annual growth rings are not easily recognized.

Gum - A comprehensive term for nonvolatile viscous plant exudates, which either dissolve or swell up in contact with water. Many substances referred to as gums, such as pine and spruce gum, are actually oleoresins.



The Wood Glossary






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