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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. |
| a stew of meat, vegetables, potatoes, etc. |
Ames test n.
A test in which strains of Salmonella that are unable to synthesize histidine are introduced into a test substance lacking in histidine. If the strains then regain the ability to synthesize histidine, the substance is considered mutagenic and thus carcinogenic.