1. mass; lump; clod; clump
2. noduleGeology, etc. term
3. baby boom generation (of 1947-1949); babyboomer (born between 1947-1949)Abbreviation, See also 団塊の世代
Wikipedia definition
4. Nodule (geology)A nodule in petrology or mineralogy is a secondary structure, generally spherical or irregularly rounded in shape. Nodules are typically solid replacement bodies of chert or iron oxides formed during diagenesis of a sedimentary rock. Nodules may be hollow as geodes or vugs or filled with crystals and intricate geometric shrinkage patterns as in septarian nodules.
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