h₁ed-

Among the most securely reconstructed PIE verbal roots, meaning "to eat." Attested in Latin edere, Greek édō, Sanskrit átti, English eat, and Hittite ēd-/ad-.‌​‌​‍​‌​‍​‌​‌​‌​‌​‌​‌​‌​‌​‌​‍​‍​‌​‍​‌​‌​‌​‌​‍​‌​‍​‍​‍​‌​‌​‍​‍​‍ The derivative *h₁d-ónt- ("tooth") is continued in Latin dēns, Greek odoús, and English tooth.

Discussion

The root *h₁ed- ("to eat") is one of the most securely reconstructed verbal roots in PIE, with cognates preserved in every major branch and minimal semantic drift.‌​‌​‍​‌​‍​‌​‌​‌​‌​‌​‌​‌​‌​‌​‍​‍​‌​‍​‌​‌​‌​‌​‍​‌​‍​‍​‍​‌​‌​‍​‍​‍ The reconstruction appears in Pokorny (IEW 287–289), Rix (LIV²), and all standard handbooks. The laryngeal *h₁ is established by the non-colouring of the root vowel *e and by the Hittite evidence (ēd-/ad-), where the laryngeal is directly reflected in the spelling. The root belongs to the innermost core of basic vocabulary, and its resistance to lexical replacement over millennia accords with the patterns identified by Swadesh and subsequent work on lexical stability.

Latin edere ("to eat") continues the root directly, though in spoken Latin it was progressively replaced by mandūcāre (whence French manger, Italian mangiare). The Latin form survives in the learned vocabulary: edibilis ("edible"), obēsus ("having eaten to excess," whence obese), and comēsse ("to eat up," whence comestible through French). Greek édō (ἔδω, "I eat") is archaic in Attic prose, where esthíō (ἐσθίω) supplanted it, but the root survives productively in the derivative odoús (ὀδούς, "tooth," from *h₁d-ónt-, "the eating one"), whence odontology, orthodontics, and periodontal.

Sanskrit átti ("eats"), with gemination of the dental, shows the regular Indo-Iranian development. The derivative ánna ("food, rice") is a culturally central term. Avestan asti confirms the Iranian form. Hittite ēd-/ad- provides the earliest written attestation and is treated by Kloekhorst (2008), who identifies the alternation between ē- and a- as reflecting the PIE ablaut of the root (*h₁éd- full grade versus *h₁d- zero grade).

In Germanic, Proto-Germanic *etaną yields Gothic itan, Old English etan (Modern English eat), Old High German ezzan (Modern German essen), and Old Norse eta. The phonological development is fully transparent: *h₁ is lost, *e is retained, and *d > *t by Grimm's Law. Lithuanian ė́sti (used primarily of animals in modern Lithuanian) and Old Church Slavonic jasti ("to eat") continue the Balto-Slavic reflex. Old Irish ithid ("eats") and Welsh ys preserve the Celtic forms.

The derivative *h₁d-ónt- ("tooth," literally "the eating one") is itself a significant reconstruction, confirmed by Latin dēns (genitive dentis), Greek odoús (genitive odóntos), Sanskrit dán (genitive datás), and Proto-Germanic *tanþs (English tooth, German Zahn, with Grimm's Law). This derivational relationship between "eat" and "tooth" is discussed by Beekes (s.v. ὀδούς) and provides a textbook illustration of PIE agent-noun morphology applied to body-part terminology.

Laryngeal Analysis

Initial h₁ (non-colouring).

Ablaut

Full grade *h₁ed-, zero grade *h₁d-.