Definitions for yellow spot
Random House Webster's College Dictionary
Ref: macula (def. 2b). 2 2
Origin of yellow spot:
any of several fungous or viral diseases characterized by yellow spotting on the leaves
macula, macula lutea, macular area, yellow spot(noun)
a small yellowish central area of the retina that is rich in cones and that mediates clear detailed vision
The spot on a snooker table where the yellow ball is normally placed.