Sorry, no dictionaries indexed in the selected category contain the word 250b.
You might try using the wildcards * and ? to find the word you're looking for. For example, use
| 250* | | to search for words beginning with 250, or |
| *50b | | to search for words ending with 50b |
Also,
expand:250b | |
to search for phrases that spell out 250b |
If you're sure it's a word, try doing a general web search for 250b:
Google, AltaVista, other sources...
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