Fetus(n.) The young or embryo of an animal in the womb, or in the egg; often restricted to the later stages in the development of viviparous and oviparous animals, embryo being applied to the earlier stages.
Thesaurus Entries
Anlage, Euglena, adenovirus, aerobe, aerobic bacteria, amoeba, anaerobe, anaerobic bacteria, animalcule, bacillus, bacteria, bacterium, base, basis, beginning, blastula, bud, bug, coccus, colon bacillus, diatom, disease-producing microorganism, dyad, echovirus, egg, embryo, enterovirus, fetus, filterable virus, flagellate, fount, fungus, germen, gram-negative bacteria, gram-positive bacteria, larva, loins, microbe, microorganism, microspore, microzoa, mold, monad, nematode, nonfilterable virus, nucleus, nymph, origin, ovum, paramecium, pathogen, picornavirus, protozoa, protozoon, reovirus, rhinovirus, rickettsia, root, rudiment, salmonella, saprophyte, seed, source, spark, spermatozoon, spirillum, spirochete, spore, sporozoon, staphylococcus, start, streptococcus, tetrad, triad, trypanosome, vibrio, virus, volvox, vorticellum, zoospore, zygote