What term is used for a sex cell?

The term used for a sex cell is "gamete." Gametes are the specialized reproductive cells involved in sexual reproduction that carry genetic information from each parent. In humans, there are two types of gametes: sperm cells produced by males and egg cells produced by females. These gametes combine during fertilization to form a zygote, which eventually develops into an embryo.

Other terms mentioned do not refer specifically to sex cells. An embryo is a developing organism that follows fertilization, while a fetus refers to the later stages of development in the womb. A zygote is the initial cell formed when two gametes unite but is not itself a sex cell. Therefore, "gamete" specifically refers to the sex cells involved in reproduction.