1. An- (before vowels): Means "without," "not," or "lacking." This prefix is uncommon because it's often confused with "a-" which has the same meaning but is used more frequently.
* Anarchic: Without rules or control.
* Anodyne: Not likely to cause offense or strong emotion; harmless.
2. Auto-: Means "self" or "by oneself."
* Autochthonous: Originating in the place where found; native.
* Autogenous: Originating or produced within an organism or system.
3. Dia-: Means "through," "across," or "between." It's uncommon because it's often replaced by "trans-" or "inter-."
* Diaphanous: Very delicate and translucent; almost transparent.
* Diachronic: Relating to change over time.
4. Epi-: Means "upon," "on," or "over." It's sometimes confused with "hypo-," which means "under."
* Epigram: A concise and witty saying.
* Epicenter: The point on the Earth's surface directly above the focus of an earthquake.
5. Hypo-: Means "under," "beneath," or "less than." It's sometimes confused with "epi-," which means "upon."
* Hypoglycemia: Abnormally low blood sugar.
* Hypothermia: Abnormally low body temperature.