Solidify
Coagulate, Freeze
noun, verbal noun
Your pudding congealed and is all hard. How on earth did it solidify like this? It shouldn't freeze unless you put it in the freezer. Unless, did you? Oh...
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
煮詰めたジャムは、冷めてくると粘性が強まり、ゼリー状に凝固します。
When the jam I boiled cools it will become viscous and solidify into jelly.