The correct spelling of the word is "haddest visitors", with a silent "h". The IPA phonetic transcription for this word is /ˈhædəst ˈvɪzɪtərz/. The word "haddest" is an obsolete form of the verb "have" in the second person singular past tense, which means "you had". The word "visitors" refers to people who visit a place. So, "haddest visitors" means "you had visitors" in old English. Despite the uncommon spelling of this phrase, it was commonly used in historical literature, poetry and plays.