The most I've been able to come up with is that fetuses are embryos slightly farther along in their development. Is that correct?
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Yes, you are correct. You can read the wikipedia article about an embryo:
An embryo is a multicellular diploid eukaryote in its earliest stage of development, from the >time of first cell division until birth, hatching, or germination. In humans, it is called an >embryo until about eight weeks after fertilization (i.e. ten weeks after the last menstrual >period or LMP), and from then it is instead called a fetus.
answered Feb 27 '14 at 0:19
