Letters that make focal
a, o, f, l, c are letters that make 'focal'
2 possible definitions for 'focal'
Under this definition, focal is an adjective and has the following properties:
focus, focal point are derivatives of 'focal'.
focus, focal point pertain to 'focal'.
"focal length"
Under this definition, focal is an adjective and has the following properties:
central is similar to focal.
"focal point", "focal infection"