a 1 d 2 i 1 a 1 b 3 a 1 t 1 i 1 c 3
9 letters · 14 points in Scrabble
Meaning
adjective occurring without loss or gain of heat
origin19th-century coinage (introduced by W. J. M. Rankine in the 1860s) based on Ancient Greek ἀδιάβατος (adiábatos, “impassable”), used of terrain (rivers, forests) by Xenophon, from ἀ- (a-, “not”) + διά (diá, “through”) + βατός (batós, “passable”), from βαίνω (baínō, “to go”).
Etymology from Wiktionary, CC BY-SA 3.0