Human Nature: Science, Technology, and Life.

Eugenic Euphemisms

First, we said IVF embryos weren't pregnancies. That's technically correct: Pregnancy begins when the embryo implants in the womb. Then we called early embryos "pre-embryos" so we could dismantle them to get stem cells. That was technically incorrect, but we did it because it made us feel better. Now we're adjusting the word conception. Henceforth, testing of IVF embryos to decide which will live or die is "preconception." Don't fret about the six eggs we fertilized, rejected, and flushed in selecting this baby. They were never really conceived. In fact, they weren't embryos. According to Serhal, each was just "an affected cluster of cells."

More here.