حيج1 حَاجَ, aor. ـِ (Kr, K,) inf. n. حَيْجٌ, (TA,) i. q. حَاجَ, aor. ـُ (Kr, K:) extr., because the ا of حَاجَةٌ [which is its logical root] is [originally] و. (TA.) 4 أَحْيَجَتِ الأَرْضُ, (K,) irregular, like أَحُوَجَ, (TA,) and أَحَاجَت, The land produced the thorny plants, or trees, called حَاجٌ: (K:) or abounded therewith. (TA.) حَاجٌ, a coll. gen. n., n. un. with ة, (TA,) A certain kind of thorny plant, or tree; (S, K;) a plant of the sour kind (مِنَ الحَمْضِ): accord. to ISd, a kind of thorny plant or tree, i. q. كَبُرٌ [or caper]: or a certain plant different from that just named: or a certain kind of tree: accord. to AHn, an evergreen, of which the roots extend far into the ground; which, cooked, is used as a medicine; having slender and long leaves, seeming as numerous as the thorns: (TA:) [asparago sylvestri similis: (Golius, from Ibn-Beytár:) this name, and عَاقُول, are now applied by the Arabs to the plant called by European botanists hedysarum alhagi: see عَاقُولٌ and تَرَنْجُبِينٌ:] dim. ↓ حُيَيْجٌ; therefore its medial radical letter is ى; (K;) and ↓ حِيَيْجٌ is a chaste dial. var. of this dim., agreeably with a usage observed in similar cases [when the medial radical letter is ى]. (TA.) حُيَيْجٌ and حِيَيْجٌ: see what next precedes.