noun
dark green; deep green
A specific shade of green that is darker and richer than standard green (緑). Used as a noun or with の to describe objects.
彼女は深緑色のドレスを着ていた。
She was wearing a deep green dress.
この深緑色は森を思わせる。
This dark green color reminds me of a forest.
濃緑 also means dark green, but 深緑色 emphasizes depth and richness of the green hue.
Compound of 深 (fuka, 'deep') + 緑 (midori, 'green') + 色 (iro, 'color'). The reading ふかみどりいろ follows standard rendaku voicing of みどり to みどりいろ.