There are six forms (deverbals) which are derived from verbs and which are not generally listed in dictionaries — you must look up the infinitive of the verb to find out what they mean.
Four of these forms are declined like adjectives; they are called participles.
The other two forms are indeclinable, like adverbs, and are called deverbal adverbs; some grammars call them gerunds. When you read Russian you have to be able to recognize these forms; the following chart displays their characteristic suffixes.
  Present Past
Deverbal adverb: -я (-а) -в(ши)
Active Participle: -щ-ий -вш-ий
Passive Participle: -м-ый -нн-ый or -т-ый
All of the following forms are listed in the dictionary 5000 Russian Words and in The Russian Dictionary Tree under the infinitive form (читђть or прочитђть):
читђя   while reading
прочитђв or прочитђвши   having read
читђющий = котћрый читђет/читђл (the one) who is/was reading
прочитђвший = котћрый прочитђл (the one) who read, had read
читђемый = котћрый читђют (the one) which they are reading, is being read
прочќтанный = котћрый прочитђли (the one) which they read, had read