| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
stain (stān)
n.
A reagent or dye that is used for staining microscopic specimens.
A procedure in which a dye or a combination of dyes and reagents is used to color the constituents of cells and tissues.