E1C3T1O1D2E1R1M3
13 points
ECTODERM is validvalid
the outermost germ layer of an embryo [n ECTODERMS]
the external layer of an embryo, also EXODERM [n -S]
the outermost germ layer of an embryo [n ECTODERMS]
the external layer of an embryo, also EXODERM [n -S]