Wood Glossary

 

Back Relieved

grooves on the back face of the board that allow the board to expand an contract

Bolt Hole

a hole made by putting a bolt through

Bow

a lengthwise bend in the wood

Check

a crack across the growth rings not extending from one surface to another

Cup

a bend in the width of the wood so that it doesn’t lie flat on the ground

Knot

base of a side branch or dormant bud, it is an imperfection in the wood 

Mortise

a hold through the piece of wood

Notch

a piece of the wood missing making it non-uniform

Pith

a dark spot which was once an upward growing twig when the tree was young

Sap Wood

the outer layer of the wood of a tree, which, when the tree was living, contained tissue which provided water and food materials to the tree

Split

a crack across the growth rings extending from one surface to another

Twist

a spiral distortion along the length of a piece of timber

Variation

a natural variation of colour in the wood that is neither sap wood or pith is considered normal