"This fertilized ovum, known as a zygote, is a large diploid cell that is the beginning, or primordium, of a human being."<quoted text>
"Human development begins after the union of male and female gametes or germ cells during a process known as fertilization (conception).
"Fertilization is a sequence of events that begins with the contact of a sperm (spermatozoon) with a secondary oocyte (ovum) and ends with the fusion of their pronuclei (the haploid nuclei of the sperm and ovum) and the mingling of their chromosomes to form
a new cell. This fertilized ovum, known as a zygote, is a large diploid cell that is the beginning, or primordium, of a human being."
[Moore, Keith L. Essentials of Human Embryology. Toronto: B.C. Decker Inc, 1988, p.2]
" the beginning of a human being"
Does *not* equal human being. It's a cell. One cell. Not the whole.
noun \ˈän-ˌläg- ə\
: the foundation of a subsequent development; especially : primordium