Definition: In mathematics, a "hypoderm" is a type of function that represents a mathematical relationship between two variables. It is often used in differential equations and integral calculus to represent the rate at which one quantity changes with respect to another. A special case of a hypoderm is an ordinary differential equation (ODE) where the dependent variable is itself a function of the independent variable, and this relationship can be represented as a function that describes how the dependent variable evolves over time or space.