- previllous
- pre·vil·lous -'vil-əs adj relating to, being in, or being the stage of embryonic development before the formation of villi <a \previllous human embryo>
Medical dictionary. 2011.
previllous
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previllous — (ˈ)prē+ adjective Etymology: pre + villous : occurring before the formation of villi an embryo in the previllous stage : not yet having villi a previllous human embryo … Useful english dictionary
previllous — pre·villous … English syllables
previllous embryo — the conceptus before the chorionic villi of the placenta develop … Medical dictionary
Chorion — The outermost of the two fetal membranes—the amnion is the innermost . which together surround the embryo. The chorion develops villi (vascular fingers) and gives rise to the placenta. In Greek, the word "chorion" means "skin… … Medical dictionary
Embryo — The organism in the early stages of growth and differentiation from fertilization to, in humans, the beginning of the third month of pregnancy. After that point in time, it is termed a fetus. * * * 1. An organism in the early stages of… … Medical dictionary
