The most powerful feature is the ability to search not just for the begnning of a word or an exact match, but to also search by the end of a word or a substring. This is probably the single most powerful dropdown menu in the entire Perseus system: it instantly turns the online dictionaries in complex analytical tools!

• End search. This makes Perseus into an instant reverse dictionary. So if you want to see all the Latin words that end in the suffix "osus" you can do that.
• Substring search. This allows you to look for word-parts regardless of the prefixes and suffixes that might be attached to them. So if you want to search for all Latin words that contain "tempor" you can do that.

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