pole axis
noun
Roget 222:
centrality,
centricalness†,
center;
middle
etc.
68;
focus
etc.
74.
core,
kernel;
nucleus,
nucleolus;
heart,
pole axis,
bull's eye;
nave,
navel;
umbilicus,
backbone,
marrow,
pith;
vertebra,
vertebral column;
hotbed;
concentration
etc.
(convergence)
290;
centralization;
symmetry.
center of gravity,
center of pressure,
center of percussion,
center of oscillation,
center of buoyancy
&c.;
metacenter†.
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