sepia /ˈsiːpiə/noun 4adjective 1forms 3 noun4 •A dark, slightly reddish, brown colour. •A sepia-coloured drawing or photograph. •A dark brown pigment made from the secretions of the cuttlefish.Sepia had some use in ancient times as a writing ink, and in modern times has has occasionally been used as a pigment, but it never attained any popularity, as it is extremely fugitive. — 1930 •(no longer used) A cuttlefish. adjective1 •Of a dark reddish-brown colour.Only now did he realise how few colours there had been at the end of the universe. The world had been sepia, drained of colour and light. — 1998 formssepias · more sepia · most sepia