Homonym: tetra (Four)
The term "tetra" is derived from the Greek word for "four." It is commonly used in various fields, including biology and chemistry, to denote structures or groups that consist of four parts. For example, in chemistry, a tetrahedral shape refers to a molecular geometry where a central atom is surrounded by four other atoms at the corners of a tetrahedron.
In the context of fish, "tetra" refers to a group of small, freshwater species often kept in aquariums. Popular examples include the neon tetra and cardinal tetra, known for their vibrant colors and peaceful nature. These fish thrive in schools and are popular among aquarium enthusiasts.