Ancient Greek (and so modern Greek) did not have a native word for blue, because this color is rarely present in nature. Actually, the first civilization that was able to produce blue was the Egyptians and is (the?) one ancient civilization that had a word for blue. Κυανός=γαλάζιος=Light blue . Κυανός is used in compound words and science whereas γαλάζιος is used in everyday life.