てっぺき 鉄壁 LinksSentence search for 鉄壁Sentence search for てっぺきKanji details for 鉄 and 壁Edit in JMdict Noun1. iron wall; impregnable fortressNoun which may take the genitive case particle 'no'2. impregnable; invulnerable; unassailable; cast-iron Discussions Log in to talk about this word.