Prefixes tri and quad

A three- sided figure

• triangle
• tricycle
• trio
• tripod

a  dinosaur with three horns-- two long horns above the eyes and one short horn on the nose 

• trisect
• tripod
• triceratops
• triathon

to cut into three parts

• triangle
• trisect
• trilogy
• trilingual 

able to speak three different languages 

• triceritops
• trilogy
• trilateral
• trilingual

a three legged stool, table, or stand used to hold things, such as a camera

• tripod
• tricycle
• triathlon
• trisect

a race that combines three activities racing, smiling, and biking

• tricycle
• triathlon
• triangle
• tripod

having or involving three sides, countries, or parties.

• trilingual
• trilogy
• tricycle
• trilateral 

a vehicle with three wheels

• trilogy
• tricycle
• trisect
• triceratops

a group of three people, or things

• triathlon
• triangle
• trilogy
• trio

three related plays or novels

• triceratops
• trilogy
• trio
• trisect