mountain of; piles of; a lot of
Figurative expression comparing a large amount of something to a mountain. Used with nouns to indicate abundance.
There is a mountain of documents on the desk.
He has piles of work to do.
Standard kanji spelling; よう is normally written in kana.
Kanji spelling for よう; less common but seen in formal or literary contexts.
Compound of 山 (mountain) + の (possessive particle) + よう (appearance, likeness). Literally 'like a mountain', used figuratively to describe a large quantity.