Lesson 4: ENDO, Exo, Archy, Geo, Path, Morph, Peri

Let's explore two opposite roots! ENDO means 'within,' while EXO means 'outside.' You'll often see them paired up to describe contrary concepts.

Key Words

• A lobster's hard exoskeleton provides excellent protection from predators.
• The brightly colored bird was exotic to our region, having migrated from a foreign country.
• The patient's illness was caused by an endoparasite living inside their digestive system.

Now it's time to figure out who rules. The root ARCHY means 'rule,' and it forms the basis for words that describe different systems of government and power.

Key Words

• When the substitute teacher failed to show up, the classroom fell into a state of anarchy.
• In the company's rigid hierarchy, every employee reported to a manager from the rank above.
• England is a constitutional monarchy, where a king or queen serves as the official head of state.

Let's get our hands dirty with words rooted in the earth itself. The root GEO means 'earth' or 'ground,' and it's the foundation for many scientific and mathematical terms.

Key Words

• In geology class, we examined rock samples to learn about the Earth's history.
• Our geometry homework involved calculating the area of various shapes.
• The rocket reached its apogee, the highest point in its orbit around the Earth.

This root is a two-for-one deal! PATH can refer to feelings and suffering, but it can also relate to diseases. Let's look at both sides.

Key Words

• I feel deep sympathy for anyone who has experienced a great loss.
• His apathy about the team's success was obvious; he didn't care if they won or lost.
• The laboratory was carefully studying the pathogenic agent to understand how it caused the disease.

Prepare to see things change form. The root MORPH means 'form' or 'shape,' and it's used to describe structure, appearance, and transformation.

Key Words

• A ghost is often described as an amorphous figure without a clear, defined shape.
• Fairy tales often feature anthropomorphic animals that talk and act like humans.
• The most famous example of metamorphosis is a caterpillar turning into a butterfly.

Let's take a look around! The root PERI means 'around,' 'near,' or 'enclosing,' so it appears in words that define boundaries and surrounding areas.

Key Words

• We walked the perimeter of the park, which was exactly one mile around.
• From the submarine, the captain raised the periscope to get a 360-degree view of the ocean surface.
• While the main argument was strong, his speech was weakened by too many peripheral facts that weren't essential.