three-body
Meaning
Relating to or involving three interacting bodies, especially in physics or astronomy.
A system consisting of three bodies that are gravitationally interacting, as in the three-body problem.
Structure
Usage
The three-body problem in physics has no general analytical solution.
They conducted a simulation of a three-body stellar system.
The novel explores a fictional civilization in a chaotic three-body solar system.
Etymology
The compound "three-body" is a modern scientific formation, directly combining the cardinal number "three" with the noun "body." The word "three" has a deep Indo-European lineage, traceable to the Proto-Indo-European root trei-, which signifies the quantity. "Body," from Old English bodig, originally referred to the trunk of a person or animal but broadened to mean any material object or collection of matter. In scientific terminology, this compound transparently denotes a system of three distinct physical entities, most famously applied to the classical "three-body problem" in celestial mechanics, which studies the motion of three gravitationally interacting masses like stars or planets.
Analysis
- three: From Old English þrīe, of Germanic origin; related to Dutch drie and German drei, from an Indo-European root shared by Latin tres and Greek treis. Functions as a numerical quantifier. - body: From Old English bodig, of unknown origin. Functions as a noun denoting a physical entity or mass.