macular
stain
maculate
to spot or stain
+
-ar
verb suffix
Macular means to stain and can be thought of as maculate0 (to spot or stain0) + -ar1 (verb suffix1).
verb
  1. stain
    To stain or spot
    La tinta puede macular la ropa. // The ink can stain the clothes.
adjective
  1. macular
    Related to or affecting the macula of the eye
    El paciente sufre de degeneración macular. // The patient suffers from macular degeneration.