ر ق قr-q-q
(ض) رَقَقَ يَرْقِقُraqaqa yarqiqu (original form) ⟵ رَقَّ يَرِقُّ رِقَّةًraqqa yariqqu riqqatan: to be thin and soft.
رَقّraqq: thin membrane, parchment written upon. Only once in the Quran: ﴿وَكِتٰبٍ مَّسْطُوْرٍ فِيْ رَقٍّ مَّنْشُوْرٍ﴾ (Aṭ-Ṭūr 52:2–3)
رَقِيْقraqīq: thin, soft-hearted; also a slave (whence «رِقّriqq», i.e. slavery).