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| a fool or simpleton; ninny. |
| 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. |
| direction finder | |
| —n | |
| D/F, Abbreviation: DF a highly directional aerial system that can be used to determine the direction of incoming radio signals, used esp as a navigation aid | |
| direction finding | |
| —n | |