Psyche, the soul

Psyche (Strongs 5590)
http://lexiconcordance.com/greek/5590.html
From 5594, to breath

—Greek Word Study (Transliteration-Pronunciation Etymology & Grammar)
1) breath
    1a) the breath of life
        1a1) the vital force which animates the body and shows itself
             in breathing
             1a1a) of animals
             1a12) of men
    1b) life
    1c) that in which there is life
        1c1) a living being, a living soul
 2) the soul
    2a) the seat of the feelings, desires, affections, aversions (our heart, soul etc.)
    2b) the (human) soul in so far as it is constituted that by the right use of the aids offered it by God it can attain its highest end and secure eternal blessedness, the soul regarded as a moral being designed for everlasting life
    2c) the soul as an essence which differs from the body and is not dissolved by death (distinguished from other parts of the body)

—Thayer's (New Testament Greek-English Lexicon)
From G5594; breath, that is, (by implication) spirit, abstractly or concretely (the animal sentient principle only; thus distinguished on the one hand from G4151 [pneuma; wind, breath, spirit], which is the rational and immortal soul; and on the other from G2222 [zoe; life, vitality], which is mere vitality, even of plants.