diood
The term "diood" is not a recognized word in standard English or in any major scientific or technical lexicon. It is possible that "diood" is a misspelling of a similar-sounding word, a neologism, a typo, or a word specific to a very niche context.
Without further context, it is difficult to determine the intended meaning. If "diood" is a misspelling, common
If "diood" is a coined term, its meaning would depend entirely on the creator and the context
If this term appeared in a specific document, conversation, or creative work, examining that source material