tir- vb. "watch, watch over, guard, heed", 1st pers. aorist tirin "I watch", pa.t. tirnë(TIR), imperative tira(VT47:31) or á tirë(PE17:94), future tense tiruva "shall heed" in Markirya (also MC:213, 214); also in CO with pronominal endings: tiruvantes "they will guard it" (tir-uva-nte-s "guard-will-they-it"). The stem also occurs in palantíri (q.v.), Tirion place-name "Great Watchtower", a city of the Elves (SA:tir; in MR:176 the translation is "Watchful City")
tirinnoun "tall tower" (LT1:258; this is a verb "I watch" in the Etymologies, stem TIR.)
tirionnoun "watch-tower, tower" (TIR); in early "Qenya" the gloss was "a mighty tower, a city on a hill" (LT1:258). Tirion "Great Watchtower", a city of the Elves in the Blessed Realm (SA:tir; in MR:176 the translation is "Watchful City")
tiriosnoun (probably *tiriost-) "a town with walls and towers" (LT1:258)
tiris (tiriss-), also tirissë, noun "watch, vigil" (LT1:258, QL:93)