nodule

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nodule:

see concretionconcretion,
mass or nodule of mineral matter, usually oval or nearly spherical in shape, and occurring in sedimentary rock. It is formed by the accumulation of mineral matter in the pore spaces of the sediment, usually around a fossil or fossil fragment acting as a nucleus.
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nodule

[′näj·ül]
(anatomy)
A small node.
A small aggregation of cells.
(botany)
A bulbous enlargement found on roots of legumes and certain other plants, whose formation is stimulated by symbiotic, nitrogen-fixing bacteria that colonize the roots.
(geology)
A small, hard mass or lump of a mineral or mineral aggregate characterized by a contrasting composition from and a greater hardness than the surrounding sediment or rock matrix in which it is embedded.
(medicine)
A primary skin lesion, seen as a circumscribed solid elevation.

nodule

1. any of the knoblike outgrowths on the roots of clover and many other legumes: contain bacteria involved in nitrogen fixation
2. Anatomy any small node or knoblike protuberance
3. a small rounded lump of rock or mineral substance, esp in a matrix of different rock material
References in periodicals archive ?
However, ALR1 neither nodulated nor grew in this soil mixture.
All Beans' varieties nodulated in this soil mixture.
All bean varieties but one (Beans 2) nodulated efficiently in this soil mixture.
All beans varieties as well as Groundnut ALR2 nodulated well in this soil mixture.
The beans varieties nodulated on all soil types and their mixtures, but not on sandy soil and on clay soil in which Beans varieties 1, 3 and 4 did not also nodulate.
This is due to the fact that all beans and groundnut varieties except Groundnut 1 nodulated in these two soil types (Fig.
ciliaris grown in soil of the Mateur region was significantly more nodulated than when grown in soils of the other 3 regions, and the smallest number of nodules was observed on plants grown in soil of the Soliman region (Table 1).
a legume pasture species with potential for acid, duplex soils which is nodulated by unique root-nodule bacteria.
2] fixation, all of the legume plants were nodulated and [N.
1994) will stimulate root growth of nodulated plants; this, on one hand, would increase the uptake of nitrate, and on the other, would increase acid production when fixing [N.