discoid vs lamina

discoid

noun
  • A disk-shaped dental excavator designed to remove the carious dentin of a decayed tooth 

adj
  • Shaped like a disc/disk. 

lamina

noun
  • one of the narrow thin parallel plates of soft vascular sensitive tissue that cover the flesh within the wall of a hoof 

  • the flat expanded part of a foliage leaf or leaflet 

  • either of two broad, flat plates of bone of a vertebra that is fused with and extends from the pedicle to the median line of the neural arch to form the base of the spinous process and that along with the pedicle forms the posterior part of the vertebral foramen 

  • a fine layer that occurs in sedimentary rocks 

How often have the words discoid and lamina occurred in a corpus of books? (source: Google Ngram Viewer )