Here are some examples of how "hetero" is used in words:
* Heterosexual: Describes someone who is attracted to people of a different gender.
* Heterogeneous: Describes something composed of different elements or parts.
* Heterotrophic: Describes organisms that obtain food from other organisms.
* Heterodoxy: Describes a belief that is different from the accepted doctrine.
So, in essence, "hetero" implies a contrast or distinction between things or ideas.