focus &c 74.
core, kernel; nucleus, nucleolus; heart, pole axis, bull's eye;
nave, navel; umbilicus, backbone, marrow, pith; vertebra, vertebral
column; hotbed; concentration &c (convergence) 290; centralization;
symmetry.
center of gravity, center of pressure, center of percussion,
center of oscillation, center of buoyancy &c; metacenter†.
V. be central &c adj.; converge &c 290.
render central, centralize, concentrate; bring to a focus.
Adj. central, centrical†; middle &c 68; azygous, axial, focal,
umbilical, concentric; middlemost; rachidian†; spinal, vertebral.
Adv. middle; midst; centrally &c adj..