solid wood; natural wood
Refers to wood that is not veneered or laminated, i.e., a single piece of natural timber. Common in furniture and construction contexts.
This table is made of solid wood.
A solid wood floor has a warm feel.
Compound of 無垢 (むく, 'pure, unadulterated') + 材 (ざい, 'material, lumber'). The term literally means 'pure material', referring to wood that is not mixed or layered with other materials.