/ Dictionary / Index G G: Meaning and Definition of Find definitions for: G2 phase Pronunciation: [key] — Cell Biol. Cell Biol. the second growth period of the cell cycle, following DNA replication and preceding prophase, during which the cell forms the materials that make up the spindle. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: g (Thesaurus) gtt. GU Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language