The phrase "embryonic state" refers to the very beginning or early stage of development, similar to how a human or animal embryo is in its early stages of growth before fully developing into a baby or adult. Full definition
The ultimate goal of our laboratory is to generate ES - like cells directly from somatic cells by nuclear reprogramming... which converts adult cells back into embryonic state. (faith.org.uk)
In comparison with the cells obtained with the technique developed by Yamanaka, the stem cells obtained by CNIO therefore represent an even earlier embryonic state, with greater capacity for differentiation. (sciencedaily.com)
Wearables that attach to the skin, such as MC10's Biostamp, are also part of this category — though they're in a «more embryonic state» and require a much larger shift in consumer habits than a smart watch, Juniper says. (fortune.com)