gee'ky, (1835- ), a British geologist, born in Edinburgh. After graduation at the University of Edinburgh he became a member of the Geological Survey of Scotland, of which he was later made director. Having served for eleven years as Murchison professor of geology and mineralogy in Edinburgh, he became director of the Museum of Practical Geology in London. Geikie is considered one of the highest geological authorities and has written extensively on the subject of physiography and geology, his text-books being used in both England and the United States. He was elected president of the Geological Society of London and also served as president of the British Association for the Advancement of Science. In 1897 he came to America and delivered a series of lectures at Johns Hopkins University. Among his important works are A Text-book of Geology, Ancient Volcanoes of Britain and The Foundations of Geology.