Germinal layers
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} (Biol.), the two layers of cells, the ectoblast and entoblast, which form respectively the outer covering and inner wall of the gastrula. A third layer of cells, the mesoblast, which is formed later and lies between these two, is sometimes included.

{Germinal membrane}. (Biol.) Same as {Blastoderm}.

{Germinal spot} (Biol.), the nucleolus of the ovum.

{Germinal vesicle}, (Biol.), the nucleus of the ovum of animals. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • 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

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