h₁regʷ-
“darkness, night”Darkness, obscurity
A PIE root meaning "darkness," attested in Greek Érebos ("the underworld darkness"), Sanskrit rájas ("atmosphere, darkness"), Gothic riqis ("darkness"), and possibly Armenian erek ("evening"). Less broadly attested than other reconstructions.
Discussion
The root *h₁regʷ- ("darkness") is less broadly attested than many PIE reconstructions and carries a correspondingly lower confidence level, though the available cognate set is phonologically regular and semantically consistent. The reconstruction appears in Pokorny (IEW 857) and is discussed by Beekes (s.v. Ἔρεβος) and Mallory and Adams (1997). The labialised velar *-gʷ- and the initial laryngeal *h₁- are inferred from the pattern of reflexes, particularly the Greek and Sanskrit forms.
Greek Érebos (Ἔρεβος, "darkness, the underworld") is the most prominent reflex. In Hesiod's Theogony (line 123), Erebos is a primordial entity born from Chaos, representing the darkness beneath the earth as distinct from Nyx (Night), the darkness above it. The cosmological distinction between subterranean and atmospheric darkness is significant for the reconstruction of PIE mythology, as argued by West (Indo-European Poetry and Myth, 2007). Beekes accepts the connection to *h₁regʷ- and notes the absence of a secure Greek verbal cognate.
Sanskrit rájas ("atmosphere, dust, darkness, the middle region of the sky") shows a broader semantic range than the Greek. In Vedic cosmology, rajas denotes the atmospheric space between earth (pr̥thivī́) and sky (dyáus), characterised by obscurity relative to the luminous heaven. The later philosophical specialisation of rajas as one of the three guṇas in Sāṃkhya metaphysics — representing passion, turbulence, and activity — developed from the atmospheric sense. The phonological development from *h₁regʷ- to rájas involves the expected Indo-Iranian loss of the initial laryngeal and the regular treatment of the labiovelar.
Gothic riqis ("darkness") and Old Norse røkkr ("darkness, twilight") continue the Germanic reflex. The Old Norse form appears in the compound Ragnarøkr (or Ragnarøkkr, "twilight of the gods"), one variant of the name for the eschatological destruction in Norse mythology, though the textual tradition also preserves Ragnarǫk ("fate of the gods") with a different second element. Armenian erek ("evening") has been tentatively connected, though the phonological derivation presents difficulties that Martirosyan (Etymological Dictionary of the Armenian Inherited Lexicon, 2010) discusses without full resolution.
The pairing of *h₁regʷ- ("darkness") with other PIE terms for light and time — *lewk- ("light"), *h₂ews- ("dawn"), *nokʷt- ("night") — suggests a structured vocabulary for the divisions of the diurnal cycle. West (2007) argues that PIE possessed a cosmological framework in which darkness and light were conceptualised as opposed but complementary forces, a schema preserved independently in Greek, Vedic, and Norse mythological traditions. The limited attestation of *h₁regʷ- relative to *lewk- or *h₂ews- may reflect the greater cultural and poetic prominence of light over darkness in the preserved IE literary traditions.
Laryngeal Analysis
Initial h₁ (non-colouring).
Ablaut
Full grade *h₁regʷ-, zero grade *h₁r̥gʷ-.