Is Barotaxis positive or negative?

Moving in the direction of gravity is positive geotaxis, while movement in the opposite direction is negative geotaxis. There are many other types of taxis, including aerotaxis, barotaxis, hydrotaxis, and magnetotaxis - which are movement in response to oxygen, pressure, water and magnetic fields respectively.

What does Brachi mean in medical terms?

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