Bhaiṣajya-guru. The Medicine Buddha, a figure especially venerated in Tibet, China, and Japan. Bhaiṣajya-guru is a Buddha in the Mahāyāna who epitomizes the power of healing, both on a physical and a spiritual level. He is the subject of the Bhaiṣajya-guru Sūtra, where he is described as being dark blue in colour and holding a jar of medicinal nectar. By virtue of the twelve vows he made prior to becoming a Buddha, beings are guaranteed healing through devotional acts dedicated to him.

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

Bhaiṣajyaguru  藥師佛  Sanskrit word, the Buddha of Medicine, who quells all diseases and lengthens life. His is the Buddha in the PureLandof the Paradiseof the East.

漢英-英漢-英英佛學辭典字庫