A certain metre of verse, (M, O,) the thirteenth, (O,) consisting ofفَاعِلَاتُ مُفْتَعِلُنْ, (M, O,) twice; (M;) originallyمَفْعُولَاتُ مُسْتَفْعِلُنْ: so called as though it were the مُنْسَرِح with a foot, namely, مستفعلن, cut off. (O.)
2.
مُقْتَضَبٌ applied to verse, or poetry, and a writing, means (tropical:) Extemporized. (S, O.)
3.
And مُقْتَضَبٌ فِىعَمَلٍ means (tropical:) Untrained in a work; (A;) or tasked to do it before he can do it well. (IDrd, S.)