O - Glossary of Woodworking Terms

 Ogee: A moulding with two curves which impart a wave like profile, formed by one convex and one concave curve. Find ogee cutters here.

 OSB Panels: Also known as Oriented Strand Board. A type of engineered sheet wood similar to particle board, formed by compressed wood strands and adhesive. OSB panels are high strength and generally cheaper than plywood.

 Ovolo: A moulding with a convex surface formed from a quarter of a circle or ellipse. Find ovolo cutters here.