auxesis

from WordNet (r) 3.0 (2006)

auxesis
    n 1: growth from increase in cell size without cell division

from The Collaborative International Dictionary of English v.0.48

Auxesis \Aux*e"sis\, n. [NL., Gr. ? increase, fr. ?, ?, to
   increase.] (Rhet.)
   A figure by which a grave and magnificent word is put for the
   proper word; amplification; hyperbole.
   [1913 Webster]