(redirected from primordia)
Also found in: Thesaurus, Medical, Encyclopedia.


n. pl. pri·mor·di·a (-dē-ə)
An organ or a part in its most rudimentary form or stage of development.

[Latin prīmōrdium; see primordial.]


n, pl -dia (-dɪə)
(Biology) biology an organ or part in the earliest stage of development


(praɪˈmɔr di əm)

n., pl. -di•a (-di ə)
the first recognizable, histologically differentiated stage in the development of an organ.
[1665–75; < Latin prīmōrdium, in pl.: beginnings, elementary stage =prīm(us) first (see prime) + ōrd(īrī) to begin + -ium -ium1; compare exordium]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.primordium - an organ in its earliest stage of development; the foundation for subsequent development
organ - a fully differentiated structural and functional unit in an animal that is specialized for some particular function
References in periodicals archive ?
This paucity and the precious role of parotid salivary gland in digestion prompted to study the histogenesis which may be serving as a tool in future research on stem cell analysis of primordia of salivary gland.
Environmental factors that affect mycelium grown require, special low temperature situations to germinate primordia and fruiting bodies.
The use of gibberellin also triggered reductions in the root fresh mass of treated seedlings when compared to control (Figure 3), probably by inhibiting the initiation of lateral root primordia (Gou et al.
Inspection at two months revealed the appearance of root primordia in most of the air layers, and at four months, 100 % rooting was achieved in all four treatments.
Otoliths were mounted with the primordia facing down and sanded by hand with sequentially finer grit-size paper, as necessary, to expose the rings.
where up to ten bristles are formed from the usual three inner and three outer perianth part primordia (Vrijdaghs et al.
The plumule of the embryonic axis is differentiated in two leaf primordia, constituted by the first and second leaf sheath (Figure 4--vi and vii).
Further, during flowering the formation of pistillate organs may be favoured by high auxin level in the vicinity of differentiating primordia.
The embryo of the nine Asteraceae species is erect, and consists of two cotyledons with homogeneous mesophyll (Figure 3C), plumule with leaf primordia (Figure 3D), and hypocotyl-radicle axis relatively long (Figure 3E).