Acronym	girc
Name	great retrotetracontoctachoron
Cross sections	©
Circumradius	sqrt[2-sqrt(2)] = 0.765367
Colonel of regiment	giddic
Face vector	144, 576, 432, 48
Confer	general polytopal classes: noble polytopes
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As abstract polytope girc is isomorphic to sirc, thereby replacing octagrams by octagons, and thus groh by sroh.

Just as groh itself is the blend of the partially face-coincident compound of 3 stop, girc is the likewise blend of the compound of 9 stodip.

Incidence matrix

144 |   8 |   8   8 |  8
----+-----+---------+---
  2 | 576 |   2   2 |  4
----+-----+---------+---
  4 |   4 | 288   * |  2
  8 |   8 |   * 144 |  2  {8/3}
----+-----+---------+---
 24 |  48 |  12   6 | 48  groh