noun
two flat things
Used for counting or referring to two flat, leaf-like objects such as leaves, petals, or thin sheets. Often appears in botanical or descriptive contexts.
この植物は二葉の形が特徴的だ。
This plant is characterized by the shape of its two leaves.
二葉のうち一枚は虫に食われていた。
One of the two leaves had been eaten by insects.