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columbine (2)
columbite
columbium
Columbus
Columbus Day
columella
column
column inch
columnar jointing
columnea
columnist
colure
Colwyn Bay
colza
colza oil
COM
Com.
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columnar jointing
co·lum·nar joint·ing (plural co·lum·nar joint·ings)


noun 
Definition:
 
development of columns in cooling rock: the development of parallel prismatic columns in contracting intrusive or extrusive rock undergoing cooling
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