"grilles" in the noun sense

1. wicket, lattice, grille

small opening (like a window in a door) through which business can be transacted

2. grille, radiator grille

grating that admits cooling air to car's radiator

3. grill, grille, grillwork

a framework of metal bars used as a partition or a grate

"he cooked hamburgers on the grill"

"grilles" in the verb sense

1. grill

cook over or under a grill

"grill the sausages"

2. grill

examine thoroughly

"the student was grilled for two hours on the subject of phonology"

Source: WordNet® (An amazing lexical database of English)

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