- The microscopic structure of the wood of a plant or group of plants.
- The preparation and microscopic study of sections of wood.
- Art of preparing sections (transverse, tangential, or radial) of wood, esp. by means of a microtome, for microscopic examination.
- The art of preparing <xref>sections</xref> of <xref>wood</xref> (as by means of a <xref>microtome</xref>) for microscopic examination.