| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes. |
decarboxylation de·car·box·yl·a·tion (dē'kär-bŏk'sə-lā'shən)
n.
Removal of a carboxyl group from a chemical compound, usually with hydrogen replacing it.