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Brachio- is a combining form used like a prefix meaning “arm” or “upper arm.” It is often used in medical and scientific terms, especially in anatomy and in zoology.

Brachio- comes from the Greek ����������ī́ō��, meaning “arm.” A medical term for the upper arm is brachium, from Latin and related to the Greek ����������ī́ō��.

What are variants of brachio-?

When combined with words or word elements that begin with a vowel, brachio- becomes brachi-, as in brachialgia.

A brachiosaurus was a huge sauropod dinosaur: it was over 80 feet (24 meters) long and about 40 feet (12 meters) tall, thanks to its massive neck. Its name comes from the New Latin Brachiosaurus, which dates back to 1903.

Life-Size Brachiosaurus. Field Station: Derby

🦖❤️🦕

— The Jurassic Mag (@thejurassicmag)

The brachio- part of brachiosaurus, using the equivalent form of brachio- in New Latin, means “arm.” The -saurus part of brachiosaurus is used to name extinct reptiles and dinosaurs, from the Greek ����û���Dz�, meaning “lizard.” Brachiosaurus literally translates to “arm lizard.” The name is an allusion to the unusual length of the humerus (upper arm bone) relative to the femur (upper leg bone) in this creature.

What are some words that use the combining form brachio-?

• brachiocephalic
• brachiocrural
• brachiocubital
• brachiopod (using the equivalent form of brachio- in New Latin)
• brachioradialis

What are some other forms that brachio- may be commonly confused with?

• brachy-
• brady-
• branchio-

The combining form -cephalic refers to the “head.” What parts of the body does the brachiocephalic artery supply blood to?