grille

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A grating of metal, wood, or another material used as a screen, divider, barrier, or decorative element, as in a window or on the front end of an automobile.
• noun An opening covered with a grating.

from The Century Dictionary.

• noun A piece of openwork or grating, usually of metal, as wrought-iron.
• noun A grating serving as a gate; also, a metallic grating closing a small opening, as in a door, allowing an inmate to answer inquiries and examine applicants for admission without opening the door.
• noun The large grating separating a convent parlor into two parts, visitors being allowed only on one side of it.
• noun In pisciculture, an apparatus for holding fish-eggs during incubation, consisting of a rectangular wooden frame 20 inches long and from 7 to 8 inches wide, into which are fastened small cylindrical glass tubes, closely placed.
• In lace, having a background consisting of bars or brides crossing open spaces: also said of the background itself.

from the GNU version of the Collaborative International Dictionary of English.

• adjective A lattice or grating.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Obsolete spelling of grill.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun small opening (like a window in a door) through which business can be transacted
• noun grating that admits cooling air to car's radiator
• noun a framework of metal bars used as a partition or a grate