erythrocytePronunciation: /ɪˈrɪθrə(ʊ)sʌɪt/Definition of erythrocyte noun a red blood cell, which (in humans) is typically a biconcave disc without a nucleus. Erythrocytes contain the pigment haemoglobin, which imparts the red colour to blood, and transport oxygen and carbon dioxide to and from the tissues. Derivatives erythrocyticPronunciation: /-ˈsɪtɪk/ adjective erythrocyte in other Oxford dictionaries Definition of erythrocyte in the US English dictionary