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[[Watkins]] | `*aiw` / `*ayu`; Oldest forms `*h₂eiw`, `*h₂eyu‑`, colored to `*h₂aiw‑`, `*h₂ayu‑`. Zero-grade form `*yu‑` (earlier `*h₂yu‑`) | "Vital force, life, long life, eternity; also 'endowed with the acme of vital force, young.'"
**Pokorny**:17 | `*aiu̯-, ai̯u-` | vitality, life force
[[Calin]]| `*hā́yu-`| **lifespan** (vital force)
**Buck** (Semantic Field) | | 4 Body Parts & Functions / 4.7.4 to Live; Living; Life
## Compounds
[[*aiw-gwei "having a vigorous life"]]
## Derivatives
[[*yeu- "Vigor"]]
## Reflexes
In. *ā́yu(s)-*; Av. *āyū*, G *yaoš*; Gr. *aiôn*; Lt. *aeuus*; Ir. *áes*; Goth. *aiws*; ON *ævi*; OE *æ(w)*; OHG *ēwa*.
## Poetics
[[■ LIFE EVERLASTING]]
[[■ LONG-LIVING (gods) ∕ LONG LIFESPAN ∕ AGE]]