from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An organ or a part in its most rudimentary form or stage of development.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An aggregation of cells that is the first stage in the development of an organ
from The Century Dictionary and Cyclopedia
- n. Beginning; commencement; origin.
- n. In botany, the ultimate beginning of any structure.
- n. In embryology, the first trace of a future organ.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an organ in its earliest stage of development; the foundation for subsequent development
A mass of cells form a structure called the primordium and these divide extensively as new plant organs and tissues are formed.
At this point -- one not merely theoretical, or speculatively possible only, but absolutely fixed and determinable in our backward survey of the vital forces of nature -- we find individual parentage lost in a natural matrix, or in the vital principle implanted as a "primordium," in the earth itself.
The whole controversy, as at present conducted by the materialists and vitalists, resolves itself into this one question: -- Whether life springs from what Dr. Harvey calls a "primordium," -- a pre-existing vital germ or unit -- or whether it originates _de novo_, as the materialists assert, from infusions contained in their experimental flasks, or from plastide particles contained in protoplasmic matter, or from the still more daring hypothesis of "molecular machinery" as worked by molecular force?
From this primordium came the Progenitors, the First Races of ReasonâDragon and Giant and Goblin and Shay.
This changes, perhaps, the rate of growth of the embryonic primordium of the jaw.
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