Cyan definition

WIK wonders whether it's OK for cyan to be greenish... Isn't this a bit like 
worrying if it's OK for roquefort to be a little greenish? Surely cyan is, by 
definition, RGB minus the R -- #00ffff for those of us used to thinking in 
Netscape background terminology. Greenish would not seem out of line, 
therefore, regardless of how it looks on a Mac.

Stu Harris