The Spanish word 'brazo' (meaning 'arm') traces back through Latin 'brachium' to Ancient Greek 'βραχίων' (brakhíon), which specifically meant 'upper arm'. Interestingly, the Greek word brakhíon was derived from 'βραχύς' (brakhus) meaning 'short' - the upper arm was literally named as 'the shorter one', presumably in comparison to the whole arm or leg.

While 'brazo' itself is a common Spanish word, you might encounter it in compounds like 'brazalete' (bracelet) or 'abrazo' (hug, embrace - literally an action involving arms).

Several English anatomical and medical terms share this Greek-Latin ancestry with 'brazo'. The most common is 'brachial' as in 'brachial artery' (the main blood vessel of the upper arm). Another related term is 'embrace', which comes from the same Latin root 'brachium' through French, literally meaning to take in one's arms.