brim-strēam, m.n: the sea’s current, ocean-stream, the sea, ocean; a rapid stream, river. (BRIM-STRAY-ahm / ˈbɹɪm-ˌstɹeːam)
Detail of a miniature of a siren, from a bestiary, with extracts from Giraldus Cambrensis on Irish birds, England (Salisbury?), 2nd quarter of the 13th century. British Library.