How Does Hydrogen Power Work: Hydrogen is efficient fuel to use to generate electricity. It is available in great amount and does not put negative effects like emission of harmful gases or greenhouse effect. This non-toxic gas is easy to produce from many renewable energy sources.
Noun. 1. sheikh-the leader of an Arab village or family. Arab chief, sheik, tribal sheik, tribal sheikh. ruler, swayer-a person who rules or commands; swayer of the universe.
Full Definition of CALIPH. : a successor of Muhammad as temporal and spiritual head of Islam âused as a title. â caÂ·liphÂ·al \-lÉ-fÉl\ adjective. See caliph defined for English-language learners.efinition of CALIPH for Kids. : an important Muslim political and religious leader.