In the 1965 case griswold v. connecticut, the supreme court asserted that although the u. s. constitution does not explicitly guarantee a right to privacy, such a right exists because of the spirit of the constitution. by what term is this spirit also known by?

As explained by Justice William O. Douglas that the right to privacy was not explicitly the reason for the Supreme Court's decision but a penumbra. The constitutional right that protects an individual in this case like the self-incrimination.  Furthermore, other Justices still see this as part of the Fourteenth Amendment where an individual has a right to a due process of law which protects privacy.