germinal layers — Primary cell of the embryo: ectoderm, mesoderm, and endoderm, from which tissues and organs of the adult are formed; germ layer … Dictionary of invertebrate zoology
Germinal — Ger mi*nal, a. [See {Germ}.] 1. Pertaining or belonging to a germ; as, the germinal vesicle. [1913 Webster] 2. (Biol.) Of or pertaining to the germ, or germ cells, as distinguished from the somatic cells. [Webster 1913 Suppl.] {Germinal layers}… … The Collaborative International Dictionary of English
Germinal membrane — Germinal Ger mi*nal, a. [See {Germ}.] 1. Pertaining or belonging to a germ; as, the germinal vesicle. [1913 Webster] 2. (Biol.) Of or pertaining to the germ, or germ cells, as distinguished from the somatic cells. [Webster 1913 Suppl.] {Germinal… … The Collaborative International Dictionary of English
Germinal spot — Germinal Ger mi*nal, a. [See {Germ}.] 1. Pertaining or belonging to a germ; as, the germinal vesicle. [1913 Webster] 2. (Biol.) Of or pertaining to the germ, or germ cells, as distinguished from the somatic cells. [Webster 1913 Suppl.] {Germinal… … The Collaborative International Dictionary of English
Germinal vesicle — Germinal Ger mi*nal, a. [See {Germ}.] 1. Pertaining or belonging to a germ; as, the germinal vesicle. [1913 Webster] 2. (Biol.) Of or pertaining to the germ, or germ cells, as distinguished from the somatic cells. [Webster 1913 Suppl.] {Germinal… … The Collaborative International Dictionary of English
animal development — Introduction the processes that lead eventually to the formation of a new animal starting from cells derived from one or more parent individuals. Development thus occurs following the process by which a new generation of organisms is produced by … Universalium
gastrula — gastrular, adj. /gas troo leuh/, n., pl. gastrulas, gastrulae / lee /. Embryol. a metazoan embryo in an early state of germ layer formation following the blastula stage, consisting of a cuplike body of two layers of cells, the ectoderm and… … Universalium
Triploblastic — Trip lo*blas tic, a. [Gr. ? threefold + blast + ic.] (Biol.) Of, pertaining to, or designating, that condition of the ovum in which there are three primary germinal layers, or in which the blastoderm splits into three layers. [1913 Webster] … The Collaborative International Dictionary of English
Diploblastic — Dip lo*blas tic, a. [Gr. ? doublet + blast + ic.] (Biol.) Characterizing the ovum when it has two primary germinal layers. [1913 Webster] … The Collaborative International Dictionary of English
Homodermy — Ho mo*der my, n. [Homo + derm.] (Biol.) Homology of the germinal layers. [1913 Webster] … The Collaborative International Dictionary of English
