SUBSELLIUM Meaning of SUBSELLIUM in English [ səb'sɛlɪəm ]■ noun ( plural subsellia -lɪə ) another term for misericord (in sense 1).OriginL., from sub- 'secondary' + sella 'seat'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004