Find definition word using definition

Where can I search for words using descriptive sentences? For example, now I’m looking for a word meaning «to purify (by hand) a quantity of grain and take away anything that isn’t good grain.»

How could I get words like that? I know it in my first-language, but I don’t have a classic version of it to use in automatic translators.

Maybe a search engine that uses content words from my description and offers words that could mean the same with their dictionary definitions. Nothing I’d tried in (translate.)google.com gave me the desired result.

Update:

An example dictionary that I use is (Oxford’s Word-Power Dictionary). It’s not for the purpose of the question but for clarification.

Oxford’s has a 3,000 word list of ‘bare-bone-essentials.’ It contains the most-used words in English and all of the grammatical operators. Ideally, these are the words necessary for a learner to use an English-English dictionary such as Oxford’s. The descriptions of words in Oxford’s rely on this list for definitions.

An electronic (web-based) dictionary for word-meaning-search should have a larger list (maybe 10,000) and use a thesaurus to down-level difficult words a user may use in the search then, using all content words in the search phrase, present a list of words whose definitions seem appropriate. Another regular dictionary may be used from there.

• Example:

  Search query: «to use hands to purify a quantity of grain taking away anything that isn’t good grain.»

  Content Words: «use-hands; purify; quantity-of-grain; taking-away; anything; isn’t; good-grain»

  Filtered: «use-hands; clean; quantity-of-seeds; take-away;anything; not-good-grain»

  Words: «1; 2; 3; 4» that use the content words to varying degrees.

And that’s a five minutes’ work!

PS. Sorry about the delay; connection problems…

How do I use OneLook’s thesaurus / reverse dictionary?

OneLook lets you find any kind of word for any kind of writing.
Like a traditional thesaurus, you
can use it to find synonyms and antonyms, but it’s far more flexible.
Describe what you’re looking for with a single word, a few words,
or even a whole sentence. Type in your description and hit
Enter (or select a word that shows up in the autocomplete preview)
to see the related words.
You can order, filter, and explore the
words that come back in a variety of creative ways.

Here’s a video which
goes over some of the basics.

What are some examples?

Exploring the results

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OneLook knows about more than 2 million different
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Try exploring a favorite topic for a while and you’ll be surprised
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Filtering the results

You can refine your search by clicking on the «Advanced filters» button
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Read more details on filters if you’re interested in how they work.

I’m only looking for synonyms! What’s with all of these weird results?

For some kinds of searches only the
first result or the first few results are truly synonyms
or good substitutions for your search word.
We highlight these results in yellow.
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connected with your search in some way. We’d rather give you too many options than
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it to check its definitions and usage examples before using it in your Oscars
acceptance speech or honors thesis.

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Is this available in any language other than English?

The same interface is now available in Spanish at OneLook Tesauro
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We use a souped-up version of our own Datamuse API,
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Wikipedia, and WordNet.
Here are some known problems
with the current system.

Much gratitude to Gultchin et al for the algorithm behind the «Most funny-sounding» sort order.

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