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From The Collaborative International Dictionary of English v.0.48:
Geodesic \Ge`o*des"ic\ (j[=e]`[-o]*d[e^]s"[i^]k), Geodesical \Ge`o*des"ic*al\ (-[i^]*kal), a. [Cf. F. g['e]od['e]sique.] 1. (Math.) Of or pertaining to geodesy; geodetic. [1913 Webster] 2. (Architecture) Made of lightweight structural supporting elements connected in a manner to provide great rigidity; -- of structures; as, The geodesic dome was invented by R. Buckminster Fuller. [PJC]