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| 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. |
| the offspring of a zebra and a donkey. |
| acid-fast | |
| —adj | |
| (of bacteria and tissues) resistant to decolorization by mineral acids after staining | |
acid-fast adj.
Of or relating to bacteria that are not decolorized by an acidic alcohol solution after they have been stained.