tikhiṇa : [adj.] sharp; pointed; pungent; acrid.

A.P. Buddhadatta Mahathera, Concise Pali-English and English-Pali Dictionary [available as digital version from Metta Net, Sri Lanka]

Tikhiṇa (adj.) [Vedic tīkṣṇa of which t. is the diaeretic form, whereas the contracted forms are tiṇha (q. v.) & tikkha. Cp. also Sk. tikta pp. of tij, tejate. From *steg in Gr. sti/zw "stitch" & stikto/s, Lat. instīgo, Ohg. stehhan, Ger. stecken, E. stick] pointed, sharp, pungent, acrid; fig. "sharp," clever, cunning, acute (in this meaning only in contr. form tikkha) J v.264; DhA ii.9; iv.13; PvA 152, 221 (=tippa). (ati -- ) tikhinatā Miln 278. See also tippa & tibba & cp. tejo.

Pali-English Dictionary, TW Rhys Davids, William Stede,