conceptus

名词 conceptus:

1. 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
   同义词：embryo, fertilized egg

con.cep.tus

n.（名词）
The product of conception at any point between fertilization and birth. It includes the embryo or the fetus as well as the extraembryonic membranes.
胚胎：从受精到出生期间任一阶段产物的通称，它包括了合子或胎儿甚至胚胎膜

来源：
Latin [something conceived] * see concept
拉丁语 [构想的产物] *参见 concept