Extra Vocabulary 平面へいめん (heimen) flat surface Extra Pitch 3 Learning Done Flashcards Recall mode Meaning 平面 (へいめん, heimen) is a bonus vocabulary word meaning “flat surface”. Kanji in this word 平 even 面 mask Example sentences 1 このメガネをかけると 平面へいめんが 立体りったいに 見みえます。 Through these glasses, flat things look three-dimensional. ← Previous菊 All Extra vocabulary Next →吸い込む