Psychoid for Jung is a term that describes processes that are psyche-like or quasi-psychic but not properly so. The term is used to distinguish psychic functions from vitalistic ones. Psychoid processes lie between somatic life-energy and sheer bodily processes on the one hand and true psychic processes on the other.
Stein provides the most precise structural definition in the secondary literature, locating psychoid processes in the transitional zone between bodily energy and genuine psychic function.
, Jung’s Map of the Soul: An Introduction, 1998thesis