The Greek word "Andros" means "Man". "Roid" means "likeness". Thus it means, Man-like. A synthetic organism that looks like a human or human like characteristics.
Trivia: The word "Android" predates the use of the word "Robot". The first ever usage of the word "Androides" was in 1728, in the text of Cyclopaedia (Universal Text of Arts and Sciences), also known as the first encyclopedia.