Definitions for virescencevaɪˈrɛs əns, vɪ-
Random House Webster's College Dictionary
vi•res•cence*vaɪˈrɛs əns, vɪ-(n.)
the state of becoming somewhat green due to the abnormal presence of chlorophyll.
Origin of virescence:
The abnormal development of green pigmentation in plants normally not green, like flowers and shoots. Symptom may be characteristic of phytoplasma infection in plants.
the act or state of becoming green through the formation of chlorophyll