What is the definition of science word iris?

Iris

In the context of biology, the term "iris" has multiple meanings:

1. Iris (eye): The iris is the colored part of the eye that surrounds the pupil. It is composed of smooth muscles that control the size of the pupil, regulating the amount of light that enters the eye.

2. Iris (plant): The iris is a genus of flowering plants, commonly known as irises or flag irises. Irises are characterized by their showy flowers with three outer sepals and three inner petals. They come in a wide range of colors, including blue, purple, yellow, and white.

In the field of optics, the term "iris" refers to:

1. Iris diaphragm: An adjustable diaphragm in optical instruments, such as cameras or telescopes, that controls the amount of light passing through the lens by varying its size. The iris diaphragm is typically made of overlapping metal blades that can be opened or closed to change the aperture size.

In anatomy and embryology, the term "iris" is associated with:

1. Ciliary processes: The ciliary processes are small, finger-like projections that extend from the ciliary body, a circular structure located behind the iris in the eye. The ciliary processes produce the aqueous humor, a fluid that fills the anterior chamber of the eye.

2. Iris sphincter: The iris sphincter is a circular muscle located in the iris that controls the pupil's size by constricting it.

In the field of mathematics, the term "iris" is related to:

1. Iris function: The iris function is a mathematical function that describes the behavior of certain probability distributions. It is named after the Greek goddess Iris, who was the messenger of the gods and traveled over the rainbow.

These are just a few examples of the various meanings of the term "iris" in different scientific contexts.