germ layer germ gland • germ nucleus · · · Info · Definitions · Characters · · germ layer · · Text Common · · Latin · · Scripts 10 · · Length 3 · · Syllables Definitions · · · (noun) (embryology) any of the 3 layers of cells differentiated in embryos following gastrulation. Synonyms: germ layer. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 e latin small letter e U+0065 g latin small letter g U+0067 l latin small letter l U+006C m latin small letter m U+006D r latin small letter r U+0072 y latin small letter y U+0079