PARENCHYMA By N., Pam M.S. - April 7, 2013 noun. the operating tissues of a gland or organ, as differentiated from structurally supportive or connecting tissues. PARENCHYMA: "The parenchyma have likely been malfunctioning for some time now." Related Psychology Terms CORTEX PATHOPHYSIOLOGY PLETHYSMOGRAPH VASCULAR INSUFFICIENCY PITUITARISM AMYLOIDOSIS THERMODE PINEAL GLAND PANCREAS PARABIOSIS Cite this page: N., Pam M.S., "PARENCHYMA," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/parenchyma/ (accessed August 11, 2020).