- progonoma
- A nodule or mass resulting from displacement of tissue when atavism occurs in embryonic development; represents a reversion to structures not normally occurring in the individuals of a species, but observed in ancestral forms of that species. [pro- + G. gonos, offspring, + -oma, tumor]
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pro·go·no·ma (pro″go-noґmə) [pro- + gon- + -oma] a tumor due to misplacement of tissue as the result of fetal atavism to a stage that does not occur in the life history of the species but does occur in ancestral forms of the species.
Medical dictionary. 2011.