名詞 nodule:

1. a small node
2. small rounded wartlike protuberance on a plant
   同義詞：tubercle
3. (mineralogy) a small rounded lump of mineral substance (usually harder than the surrounding rock or sediment)

nod.ule

n.（名詞）
A small knotlike protuberance.
小結節(jié)；小瘤：小的球狀的突起物
Anatomy A small mass of tissue or aggregation of cells.
【解剖學】 結：組織的小結塊或細胞的聚集
Botany A small knoblike outgrowth, as those found on the roots of many leguminous plants.
【植物學】 節(jié)、瘤：小的球狀長出物，長于許多豆科植物的根部
Mineralogy A small rounded lump of a mineral or mixture of minerals, usually harder than the surrounding rock or sediment.
【礦物學】 礦的結核：一種礦物或礦物混合物的小圓塊，通常比表層巖石或礦渣堅硬

來源：
Middle English
中古英語
from Latin nôdulus [diminutive of] nôdus [knot] * see ned-
源自 拉丁語 nôdulus [] nôdus的小后綴 [節(jié)，節(jié)瘤] *參見 ned-

【引伸】
nod.ular