PHYSIOL'OGY, noun [Gr. nature, to discourse.]
1. According to the Greek, this word signifies a discourse or treatise of nature, but the moderns use the word in a more limited sense, for the science of the properties and functions of animals and plants, comprehending what is common to all animals and plants, and what is peculiar to individuals and species.
2. The science of the mind, of its various phenomena, affections and powers.