masca- +

(Latin: specter, witch, mask, nightmare > Italian mascera > French, masque [covering to hide or to protect the face])

enmascarar (Spanish)
To disguise.
1. Makeup that is used to darken and thicken the eye lashes.
2. A thick colored paste applied to the eyelashes with a fine brush to darken them and to give the appearance of greater length and thickness.
To apply mascara to (the eyes, etc.).
thickening mascara
A heavier mascara formula that builds up a volumizing coat of color on the lashes.