NEWCOM:All the words with meanings like 'shadow, dark, black' are put together in nearby but different entries in CED on pp. 333, 334. Cf. the related stems *tar-ʁa-, *tar-ʁǝ-t- 'black, dark, shadow', *tar-ʁǝ-nǝʁ 'shadow, darkness' and *taʁ-(nǝʁ) 'soul, life force', *taɣŋǝ- (~ -ŋɣ-) 'black'.
