embryo

An embryo is the very early stage of a living thing as it begins to grow. Think of a tiny seed that already holds the start of a future plant, or a young animal developing before birth or hatching. The word is used for both animals and plants, usually after fertilization and before later stages of development. You might also hear about "embryo donation" in IVF, when unused embryos are given to others who hope to start a family. The word often appears in biology, reproduction, and discussions about the beginning of life.

Imagine a tiny bird inside its egg before it hatches: that is an embryo. It is a time of fast change and growth, when the first basic body parts begin to form.

The word "embryo" refers to the earliest stage of development in a living organism, whether animal or plant. After fertilization, a new life begins to grow. In animals, this stage comes very early, when the basic form of the body is starting to develop. In plants, the term can refer to the young form inside a seed that can later grow into a full plant.

The term comes from the Greek word embryon, meaning "something growing within." In humans, the embryonic stage usually covers the first eight weeks after fertilization. During this important time, the major organs and body systems begin to form, laying the foundation for later growth. After this stage, the developing human is usually called a "fetus."

You'll often see the word in biology classes when learning about reproduction and development, but it is also common outside science. It appears in discussions about stem cell research, reproductive technology such as IVF, and legal or ethical questions about when life begins.

The word is not limited to animals. Plant seeds also contain embryos: tiny early forms of the future plant, with the first parts that will grow into roots, stems, and leaves when conditions are right.

Whether you're studying biology, reading about medicine, or simply thinking about how life begins, understanding the word "embryo" means recognizing that it describes a very early stage of life, full of development and possibility.