تره1 تَرِهَ, aor. ـَ He fell into what are termed تُرَّهَات, said to signify, originally, [deserts, such as are termed] قِفَار, and to be metaphorically applied to (tropical:)  false, or vain, sayings or actions or affairs; unprofitable sayings: (K, * TA:) or (assumed tropical:)  he uttered false and confused and vain speech, with somewhat of embellishment, (Lth, TA,) or without foundation, or order, or method. (Akh, TA.) تُرَّهٌ: see what next follows, in two places.تُرَّهَةٌ A small road branching off from a main road: (As, S, K:) a Persian word, arabicized: (As, S:) pl. تُرَّهَاتٌ (As, S, K) and تُرُّهَاتٌ. (TA.) b2:  A [desert, such as is termed قَفْرٌ, (see 1,) or]مَفَازَةٌ, and صَحْرَآءُ. (JK.) b3:  The first in this paragraph is the primary signification: (TA:) and hence, metaphorically, (As, S,) (tropical:)  A false, or vain, saying or action or affair; (As, JK, S K;) as also ↓ تُرَّهٌ: (S, K:) pl. of the former, تُرَّهَاتٌ (JK, S, K *) [and تُرُّهَاتٌ, as above]; and of the latter, تَرَارِيَهُ: (S, K: *) or the primary signification of تُرَّهَاتٌ is قِفَارٌ: [see 1:] and it is metaphorically applied to (tropical:)  false, or vain, sayings or actions or affairs; (K;) and unprofitable sayings: (Z, K, TA:) or, accord. to Az, false, or vain, affairs: and the sing. is ↓ تُرَّهٌ: or, accord. to IB, this last is pl. of تُرَّهَةٌ: [or rather a coll. gen. n.:] or, as some say, it is a sing.: (TA:) and accord. to Lth it signifies the act of lying, and confusing [truth and falsehood]. (Har p. 165.) [Sometimes it is followed by a syn., to give greater force to the signification:] one says التُرَّهَاتُ البَسَابِسُ and التُرَّهَاتُ الصَّحَاصِحُ: and sometimes the former word is used as a prefixed noun governing the gen. case [so that one says تُرَّهَاتُ البَسَابِسُ and ترّهاتُ الصَّحَاصِحِ: الصَّحْصَحُ is mentioned in the K, in this art., as a syn. of التُّرَّهَةُ]. (S.) b4: Also A calamity; a misfortune; an evil accident: (JK, * K:) pl. [تُرَّهَاتٌ and] تَرَارِيَهُ. (JK.) b5:  Wind. (JK, K.) b6:  Clouds, or a collection of clouds. (JK, * K.) A2:  A certain small creeping thing (دُوَيْبَّة) [found] in the sand. (JK, K.)