phac-
combining form 
or phaco- or phak- or phako-
Etymology: Greek phak-, phako-, from phakos lentil, object shaped like a lentil, mole, wart 
1. : lentil : thing shaped like a lentil 
< Phacochoerus >
< phacolith >
< Phacops >
2.
a. : lens 
< phacometer >
b. usually phak- or phako- : crystalline lens of the eye 
< phakoma >
or phaco- or phak- or phako-
1.
< Phacochoerus >
< phacolith >
< Phacops >
2.
a.
< phacometer >
b. usually phak- or phako-
< phakoma >