Definition of white spot
1
: any of several diseases of plants marked by light-colored lesions: such as
a
: a disease of alfalfa characterized by spotting and yellowing of the foliage and caused by an unbalanced water supply (as from heavy rainfall following a drought)
b
: heat canker
c
: a disease of turnips caused by a fungus (Cercosporella brassicae)
2
: ich
—usually used in plural
