* It's a misspelling. It could be a misspelling of another word. Try checking for common misspellings or looking for similar-sounding words.
* It's a made-up word. It could be a word created for a specific purpose, like in a fictional story or a specialized field.
* It's a foreign word. If you heard it in a different language, it might be a word that has no direct translation.
Can you provide more context? Where did you encounter the word "plediol"? Knowing more about its usage would help me understand its meaning.