فتر فتش فتق
فَتَشَ الشَّىْءَ, (Ṣ, O, Mṣb,) aor. ـِ, (Mṣb,) inf. n. فَتْشٌ; (Ṣ, O, Mṣb;) andفتّشهُ↓, (Ṣ, O, Mṣb,) inf. n. تَفْتِيشٌ; (Ṣ, O;) both signify the same; (Ṣ, O, Mṣb;) He examined, looked into, scrutinized, or investigated, the thing; but the latter verb is that which is commonly used. (Mṣb.) And فَتَشَ عَنْهُ, andفتّش↓, He inquired respecting it, and searched to the utmost after it. (Mṣb.) فَتْشٌ andتَفْتِيشٌ↓ signify The seeking with inquiry or examination or scrutiny or investigation. (Lth, IF, A, O, Ḳ.) You say,فَتِّشْ↓ وَلَا تُفَنِّشْ Seek thou with inquiry &c., and be not thou lax, or remiss. (A, TA.)
see above, in four places.
فاتشهُ, inf. n. مُفَاتَشَةٌ, [He inquired of him, or examined him, diligently.] (Sh, TA in art. ثور.)
[فَتَّاشٌ One who examines things, looks into them, scrutinizes them, or investigates them, much, or diligently; who inquires much, or diligently, and searches to the utmost; who seeks much, or diligently, with inquiry, examination, scrutiny, or investigation.]