Anaximander Syllabification: (A·nax·i·man·der)Pronunciation: /əˌnaksəˈmandər, əˈnaksəˌmandər/Definition of Anaximander (circa 610-circa 545 bc), Greek scientist from Miletus. He believed the earth to be cylindrical and poised in space and is reputed to have taught that life began in water and that humans originated from fish. Anaximander in other Oxford dictionaries Definition of Anaximander in the British & World English dictionary