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| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question. |
| acid rain | |
| —n | |
| rain that contains a high concentration of pollutants, chiefly sulphur dioxide and nitrogen oxide, released into the atmosphere by the burning of fossil fuels such as coal or oil | |
A type of precipitation made up of dilute acids, primarily a by-product of heavy industry.
Note: Acid rain is a result of the combination of water with chemicals released into the atmosphere by the burning of fossil fuels.