Pronunciation (UK) IPA (key): /ˌpɜː.pənˈdɪk.jə.lə(r)/ enPR: pû"pəndĭ'kyələ(r), (US) IPA (key): /pɝ.pɛnˈdɪk.ju.lɚ/ or /pɝ.pənˈdɪk.jə.lɚ/ Audio (US)(file) Adjective Positive perpendicular Comparative none Superlative none Perpendicular means "at a ninety degree angle to". Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads