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The product of conception at any point between fertilization and birth, especially the embryo and the extraembryonic membranes.
[Latin, something conceived; see concept.]
any of various products of conception, including the embryo, fetus, and surrounding tissue
n., pl. -tus•es.
an embryo or fetus and all its associated membranes.
[1935–40; < New Latin; Latin: the action of conceiving, hence, fetus, embryo <concipere to conceive]
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|Noun||1.||conceptus - an animal organism in the early stages of growth and differentiation that in higher forms merge into fetal stages but in lower forms terminate in commencement of larval life|
animal, animate being, beast, creature, fauna, brute - a living organism characterized by voluntary movement
blastosphere, blastula - early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs
gastrula - double-walled stage of the embryo resulting from invagination of the blastula; the outer layer of cells is the ectoderm and the inner layer differentiates into the mesoderm and endoderm
morula - a solid mass of blastomeres that forms when the zygote splits; develops into the blastula