h₁ésh₂r̥
“blood, vital fluid”blood, vital fluid
Root for blood, yielding Greek ear, Hittite eshar, Sanskrit asrk.
Discussion
The PIE noun *h₁ésh₂r̥ (blood, vital fluid — genitive *h₁sh₂nós) is another member of the archaic heteroclitic r/n-stem class alongside *wódr̥ (water), *péh₂wr̥ (fire), and *yḗkʷr̥ (liver). The alternation between *-r in the nominative and *-n in the oblique cases marks this as one of PIE's oldest nouns — a word so ancient that it preserves an inflectional pattern that was already irregular in the proto-language.
Hittite ēšḫar (blood) provides the most archaic attestation, preserving the initial laryngeal as Hittite e- and the internal *h₂ as ḫ. The Hittite form is the cornerstone of the reconstruction and a primary exhibit for the laryngeal theory.
Latin does not directly continue the word for blood (Latin sanguis is from a different root), but the Italic branch may preserve a trace in the Oscan-Umbrian forms. The Latin word aser (blood) appears in early sources but was displaced by sanguis in classical Latin.
Greek éar (ἔαρ, "blood" — poetic and archaic) preserves the root in a literary register. The word is rare in prose Greek, where haîma (αἷμα, "blood" — from a different root) dominated, but its presence in Homer confirms its PIE ancestry.
Sanskrit ásṛj- (blood — genitive asnás) continues the root with the expected alternation: nominative with -r, oblique with -n. The Vedic form is used in both ritual and medical contexts — blood sacrifice and the observation of wounds.
The Germanic branch shows a different continuation: the related form produced Old English swāt (blood, sweat — the phonological connection is through a labialised variant), though the exact derivation is debated. English gore (OE gor, "filth, dung, clotted blood") may be distantly related.
The heteroclitic r/n-stem pattern of *h₁ésh₂r̥ is itself theoretically significant. These nouns — blood, water, fire, liver — are among the most basic substance terms in any language, and their shared grammatical archaism suggests they belong to the oldest stratum of PIE vocabulary, possibly inherited from a pre-PIE stage. The blood-word stands alongside the water-word and the fire-word as evidence for this deep lexical archaeology.
Notes
Pokorny 343. Heteroclitic r/n-stem noun.