idealize comes from ideal + -ize, ultimately from Ancient Greek idea ('form, pattern'), from idein ('to see'). Morphologically, the ending is part of the etymology: the suffix is attached to the older base named in the history, producing a later English derivative. In present English, the verb sense is "to regard or represent as perfect or better than reality", so the historical development ends in a clearly identifiable modern dictionary use. The same base also appears in related forms such as ideal, idealism, idealist, and idea, and in derivatives such as idealization, idealizer, and idealized. Its semantic neighborhood includes glorify, romanticize, exalt, and perfect, which helps locate the modern sense without adding a separate etymological claim. The named historical forms include Ancient Greek idea.