The word(s) "solid" appears 2 time(s) in 2 verse(s) in Quran in Muhammad Pickthal translation.

(1) And thou seest the hills thou deemest solid flying with the flight of clouds: the doing of Allah Who perfecteth all things. Lo! He is Informed of what ye do.

(سورة النمل, An-Naml, Chapter #27, Verse #88)
(Arabic, Transliteration, Urdu (Ahmed Ali), Urdu (Jalandhry), Farsi, Yusuf Ali, Shakir, Picthal, Mohsin Khan, French, Spanish, Indonesian, Malay, German, Bosnian, Russian, Dutch, Italian, Portuguese, Tafsir - Jalal ad-Din, Tafsir - King Fahad Quran Complex)

(2) Lo! Allah loveth them who battle for His cause in ranks, as if they were a solid structure.

(سورة الصف, As-Saff, Chapter #61, Verse #4)
(Arabic, Transliteration, Urdu (Ahmed Ali), Urdu (Jalandhry), Farsi, Yusuf Ali, Shakir, Picthal, Mohsin Khan, French, Spanish, Indonesian, Malay, German, Bosnian, Russian, Dutch, Italian, Portuguese, Tafsir - Jalal ad-Din, Tafsir - King Fahad Quran Complex)