A distinct use of the term sound from its use in physics is that in physiology and psychology, where the term refers to the subject of perception by the brain. The field of psychoacoustics is dedicated to such studies. The physical reception of sound in any hearing organism is limited to a range of frequencies.
polygamy. the condition of having more than two spouses simultaneously. â polygamist, n. â polygamous, adj. the practice or state of being married to more than one person at a time. â polygamous, adj.
Polytypism is a type of polymorphism wherein different polymorphs exist in different domains of the same crystal. It has to do with the way that individual layers are stacked within a crystal structure. Polytypism has little geologic consequence, and will thus not be discussed further here.