derivNB: Given that the etymology of several items belonging to √ḤṢN remains unclear so far, the list below contains only those values that seem to be directly related to ḥiṣn. For other values of the root, cf. ↗ḥaṣuna, ↗ḥiṣān, ʔabū ’l- ↗ḥuṣayn, and ↗ʔiḥṣān, as well as, for the overall picture, root entry √ḤṢN.►ḥiṣn ṭāʔir, n., Flying Fortress►ḥaṣuna, u (ḥaṣānaẗ), vb. I, 1 to be inaccessible, be well fortified: perh. denom.; 2 ↗²ḥaṣuna.
►ḥaṣṣana, vb. II, 1 to make inaccessible (s.th.); 2 to strengthen (s.th.); 3 to fortify, entrench (s.th.); 4 to immunize, make proof (ḍidda against): D-stem, caus., prob. denom.
►ʔaḥṣana, vb. IV, 1 to make inaccessible (s.th.); 2 to fortify, entrench (s.th.): prob. denom.; 3 ↗²ḥaṣuna.
►taḥaṣṣana, vb. V, 1 to strengthen one’s position, protect o.s.; 2 to be fortified; 3 to be secure, be protected: Dt-stem, intr./pass./self-ref., prob. denom.►ḥaṣīn, adj., 1 inaccessible, strong, fortified, firm, secure(d), protected; 2 immune, proof, invulnerable (ḍidda against): quasi-PP I. | al-ḥiṣn al‑~, n., stronghold (fig.; e.g., of radicalism).
►ḥaṣānaẗ, n.f., 1 strength, ruggedness, forbiddingness, impregnability, inaccessibility; 2 ↗²ḥaṣuna; 3 invulnerability, inviolability; 4 immunity (of deputies, diplomats; against illness): vn. I of ḥaṣuna, see above and ↗s.v.
►taḥṣīn, n., pl. ‑āt, n., 1 fortification, entrenchment; 2 strengthening, cementing, solidification; 3 immunization: vn. II.
►taḥaṣṣun, n., securing, safeguarding, protection, protectedness: vn. V.
►muḥaṣṣan, adj., 1 fortified; 2 entrenched; 3 immune, proof (ḍidda against): PP II.