DECIBEL

The logarithmic unit that is used to express the loudness or intensity of sound.

DECOMPOSITION

The process that takes a complex item and breaks into its elements. Organisms also break down by decomposition.

DEEP CEREBELLAR NUCLEUS

The nuclei at the base of the cerebellum.

DEFENSE

Features and behaviour that deters other animals from harming it.

DEFICIENCY NEED

A need that is created by a lack of something.

DEHYDRATION REACTIONS

The reactions of the body when the water supply levels fall below a certain quota.

DELAY OF REINFORCEMENT

The time between a response and its enforcer.

DELIBERATE PSYCHOLOGICAL EDUCATION (DPE)

A curriculum designed to affect a young adult personal, ethical, aesthetic and philosophical development.

DELUSION OF GRANDEUR

Falsely attributing one's self with great ability, importance, worth, identity or power. See megalomania.

DEMASCULINIZATION

Not enough androgens are present for a foetus to develop normal masculine traits.

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