Śakra (Pāli, Sakka). The king or chief of the gods (deva). Śakra rules over the heaven of the 33 gods (Sanskrit, trāyastriṃśa; Pāli, tāvatiṃsa) which is the lowest of the heavens and thus the closest to the human world. He makes frequent appearances in Buddhist literature and is regarded as a devotee of the Buddha and protector of the faith. He is regarded as noble, kindly, and just and a guardian of the moral law, but still subject to many frailties. The figure of Śakra bears some relation to the Vedic god Indra.

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

śakrá mf(ā́)n. strong, powerful, mighty (applied to various gods, but esp. to Indra)
RV. AV. TBr. Lāṭy.

• m. N. of Indra MBh. Kāv. &c

• of an Āditya MBh. Hariv.

• of the number, fourteen' Gaṇit.

• Wrightia Antidysenterica L.

• Terminalia Arjuna L.

Sanskrit-English Dictionary, by M. Monier William