Clarissan adjective 2noun 1forms 1 adjective2 •Of or relating to the Order of Saint Clare.Strict enclosure presented additional complexities when the convent churches were open to the lay public, as was the case in the Clarissan order ("Poor Clares"). — 2005 •Of or relating to someone named Clarissa.This sort of reading identifies the whole novel with a naïve Clarissan view... — 2008 noun1 •Synonym of Poor Clare: a nun of the Order of Saint Clare.The rule of the Clarissans, who take their name from St Clara, was very strict. — 1865 formsClarissans