Here are some possibilities:
* "Terrent" could be a misspelling of "terrestrial" which means "relating to the earth or its inhabitants" or "relating to land as opposed to water".
* "Terrent" could be a misspelling of "torrent" which means "a strong and fast-moving stream of water or other liquid" or "a large amount of something that suddenly appears or is released".
* "Terrent" could be a word from a specific field or dialect.
If you could provide more context about where you encountered this word, I might be able to help you figure out the intended meaning.