gyral vs rotational

gyral

adj
  • Moving circularly or spirally; gyratory; whirling. 

  • Of or pertaining to a gyrus 

rotational

adj
  • Of, pertaining to or caused by rotation. 

noun
  • An employee in a job rotation scheme. 

  • Something, such as a joint, that moves by rotating. 

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