"primordium" is a real word that can be used in written English.
It is a noun that refers to the earliest stage of something's development. For example, you could say, "The primordium of the company's success was the introduction of its innovative new product."
His hope is that it will become possible to implant the primordium into a patient's gum, in the place of a removed or lost tooth.
After implantation, it would grow, form roots that would attach themselves to the jaw, and eventually erupt into the mouth after only a few weeks.For the process to work reliably, however, it will be necessary to persuade the primordium to develop into a full-fledged tooth.
Thus, as the site of each primordium is determined, a strand forming in the adjacent region of the stem will contribute to the cylinder, but at a higher level than the preceding strand.
A slight bulge (a leaf buttress) is produced, which in dicots continues to grow and elongate to form a leaf primordium.
Apical growth dominates in the tobacco-leaf primordium until a height of about 0.5 millimetre (0.02 inch) is reached.
The strand passing upward toward a leaf primordium usually is composed of branches arising from strands that enter the two nearest older leaves below it.
In many monocotyledons, such as maize, the several vascular strands that pass down from each leaf primordium into the stem do not contribute to a single cylinder but are scattered in the ground tissue, or parenchyma, of the stem.
At first, all cells are meristematic; then, while the primordium is still small, cells in the central zone cease DNA synthesis, and this zone becomes the new quiescent centre.
In the development of the maize leaf, the primordium arises first as a prominence some distance below the apical dome.
In some species a tunica of more than one cell layer quickly forms, so that the new apex appears as a miniature version of the main one; alternatively, the differentiation may not become apparent until the new primordium has attained considerable bulk.
Pericyclic cells about to produce a root primordium synthesize ribonucleic acid, in anticipation of the period of growth and morphogenesis that will result in a new apex.
