alimentary, alimental, nourishing, nutrient, nutritious, nutritive
Meaning: of or providing nourishment; "good nourishing stew"
But the soul has many other powers, such as the sensitive and nutritive powers, and therefore the comparison fails.
Hence it is clear that the sensitive and nutritive souls must be united to a body in order to exercise their functions.
Thus the intellectual soul contains virtually whatever belongs to the sensitive soul of brute animals, and to the nutritive souls of plants.
Objection 1: It would seem that besides the intellectual soul there are in man other souls essentially different from one another, such as the sensitive soul and the nutritive soul.
Wherefore it is clear that in the nutritive part all the powers are active, whereas in the sensitive part all are passive: but in the intellectual part, there is something active and something passive.
We must therefore conclude that in man the sensitive soul, the intellectual soul, and the nutritive soul are numerically one soul. This can easily be explained, if we consider the differences of species and forms.
It is not, however, possible that the functions of nutrition, growth, and generation, through which the nutritive soul operates, can be exercised by the heavenly bodies, for such operations are incompatible with a body naturally incorruptible.