| a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
carboxylase car·box·yl·ase (kär-bŏk'sə-lās', -lāz')
n.
An enzyme that catalyzes a carboxylation or decarboxylation reaction.