りんかい 臨界 Common word LinksSentence search for 臨界Sentence search for りんかいKanji details for 臨 and 界Edit in JMdict Noun1. boundaryNoun2. (nuclear) criticalityPhysicsNoun or verb acting prenominally3. critical (mass, pressure, temperature, state, point, etc.) Discussions Log in to talk about this word.