adj :  of, relating to, or shaped like a torus or segment of a torus : specif  :  being a simple lens having for one of its surfaces a segment of an equilateral zone of a torus and consequently having different refracting power in different meridians .
 
   
 
Similar sounding terms:  DRG   drug  drug·gie  tergo 
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2024.