The derivation
The traditional account is elegant: ψυχή is a noun built on the verb ψύχω "to blow, breathe" — the soul as the breath that leaves. Frisk lays out the pattern plainly: ψυχή stands to ψύχω exactly as πνεῦμα stands to πνέω, as Latin animus and anima stand to Sanskrit aniti "to breathe" (Frisk, GEW s.v. ψυχή). Chantraine agrees, deriving ψυχή as a post-verbal formation from ψύχω "souffler" and tracing the verb to an Indo-European root *bʰes- "to blow," with Sanskrit kin in bhastrā- "bellows" and Vedic á-psu- "without breath" — the analysis owed to Benveniste (Chantraine, DELG s.v. ψυχή, Et.). Notably, the verb itself is vanishingly rare in the breathing sense: Beekes records ψύχω "to blow" in Homer only once (Il. 20.440), and both Frisk and Chantraine observe that πνέω won the war for "breathe," pushing ψύχω toward its other career — "to cool, to dry in the wind," a shift Frisk finds unsurprising "for a seafaring people."
Here the authorities part ways. Beekes grants that the nominal formation fits the verb "semantically and formally," and then dismantles the deeper history: "There is hardly any evidence for an IE root *bʰes- 'to blow'… Therefore, the word is more probably of Pre-Greek origin" (Beekes, EDG s.v. ψύχω). He marks ψυχή itself ⟨PG⟩ — a loan from the lost substrate language of the Aegean — and notes that Mumm and Richter (2008) have pressed the doubt further, arguing the meaning "cool" may be primary, with "breath, soul" secondary: the derivation story inverted. Frisk, for his part, records and rejects a third proposal (Thieme's compound analysis) with the driest verdict in the dossier: speciosius quam verius — "more attractive than true."
So the state of the question, honestly stated: breath-soul from *bʰes- (Chantraine, Frisk, after Benveniste) versus Pre-Greek substrate word (Beekes), with the semantic arrow itself contested. The disagreement is the scholarship.
Root
- *bʰes- "to blow" — accepted by Chantraine and Frisk (after Benveniste, BSL 1932); cognates claimed in Skt. bhastrā- "bellows," bhasman- "ashes," Vedic á-psu- "breathless."
- Rejected by Beekes, who finds the root under-evidenced (Mayrhofer brackets the Sanskrit material) and assigns ψυχή to Pre-Greek.
In the corpus
2,286 occurrences across 22 works — and the distribution is itself a history of the soul. Homer uses ψυχή sparingly: 34 times in the Iliad, 47 in the Odyssey, beginning with the very proem — the ψυχάς of heroes hurled to Hades (Il. 1.1–5; earliest Odyssey attestation at Od. 1.5). In Plato the word becomes philosophy's center of gravity (Republic 225, Phaedo 135), and in Plotinus it explodes: 1,399 occurrences in the Enneads — more than half the corpus total. From battlefield breath to the engine of Neoplatonic metaphysics, the count alone tells the story.
The word's world
In Homer, ψυχή is not the seat of thought or feeling — it neither thinks nor wills, and is "not located in some specific part of the body"; it matters only at the boundary of life, the thing whose departure is death, while the psychological agents — θυμός, νόος, φρήν, κραδίη — perish with the body (Sullivan, Psychological and Ethical Ideas: What Early Greeks Say). Its name "marks it off as something airy and breathlike, revealing its presence in the breathing of the living man… It escapes out of the mouth — or out of the gaping wound of the dying" (Rohde, Psyche). What survives is the shade in Hades — in Chantraine's summary, a breath-thing compared to smoke and to bats, light enough that later Greek made ψυχή its word for the butterfly, the night-moth ψυχάρι.
Authorities: Beekes, Etymological Dictionary of Greek (Brill 2010) s.v. ψυχή (scan p. 1722, #6680) and s.v. ψύχω (pp. 1722–1723, #6681); Chantraine, Dictionnaire étymologique de la langue grecque s.v. ψυχή (scan pp. 1314–1315, #8937); Frisk, Griechisches etymologisches Wörterbuch s.v. ψυχή (scan pp. 2113–2114, #6213; Nachträge p. 2316, #8061). Interpretive sources retrieved from the Oracle library (Classical Philology & Ancient Thought): Sullivan; Rohde, Psyche (1894); cf. Snell, The Discovery of the Mind (1953). Bibliographic anchors named by the dictionaries themselves: Onians, The Origins of European Thought 93ff.; Jarcho, Philologus 112 (1968). Corpus figures: Logoi corpus, live. Receipt: soul-word-journey-v0.