Cakra-saṃvara Tantra. The root tantra of the group of Mother Tantras associated with the yi-dam Cakra-saṃvara. Known as the Śrī-cakra-saṃvara-guhya-cintya Tantra, the root text describes the deity and main practices that relate to him. It was translated into Tibetan by Gayadhara and Drogmi Śākya Yeshe.

A Dictionary of Buddhism, Oxford University Press, 2003, 2004 (which is available in electronic version from answer.com)