Valmiki Ramayana Bala Kanda Sarga 17 Shloka 15
Original Shlokaमारुतस्यात्मजश्श्रीमान्हनुमान्नाम वीर्यवान् । वज्रसंहननोपेतो वैनतेयसमो जवे।।1.17.15।।
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श्रीमान् dignified and graceful, वीर्यवान् endowed with prowess(wisdom andcourage), वज्रसंहननोपेत: with his body as hard as diamond, जवे in speed, वैनतेयसम: equalling Garuda, हनुमान् नाम named Hanuman, मारुतस्य आत्मज: son of Vayu, Windgod, Vayu.
Vayu, the windgod, begot a son named Hanuman, mighty and graceful, having a body as hard as a diamond and speed equal to Garuda's.