zygote
/ˈzaɪɡoʊt/
noun
- A cell formed by the union of two gametes (such as an egg and sperm); the earliest stage of a developing organism.
- In humans, the zygote contains genetic material from both parents.
- The doctor explained that a healthy zygote is the first step in a successful pregnancy.
- The zygote begins to divide into many cells just hours after fertilization.