worthless securityglossary / worthless security A security that has lost its value, for which a loss (usu. capital) is allowed for tax purposes. IRC (26 USCA)§ 165. [Cases: Internal Revenue 3429.] 词条贡献者 资深译员Chris,毕业于一所培养高级翻译以及跨文化事务专家的精英大学,专注翻译各种与卫星及航天技术诉讼有关的法律文件。