Expressions (phrases, clauses, etc.), Pre-noun adjectival (rentaishi)
every conceivable; every single; every possible; all kinds of
Usually written using kana alone
わたしはこの図書館のありとあらゆる本を読んだ。I've read any and every book in this library.
Also written 有りと有らゆる【ありとあらゆる】