The Spanish word 'madridismo' combines the city name 'Madrid' with the suffix '-ismo' (which forms nouns indicating a doctrine or attitude). The city name Madrid itself has an interesting etymology, tracing back through Arabic 'mağrīt' to Romance 'matric' and ultimately to Latin 'matrix' meaning 'womb' or 'source'. This etymology likely refers to Madrid's origins as a settlement near water sources or springs.

The modern term 'madridismo' specifically refers to the culture, support, and enthusiasm surrounding Madrid, particularly in relation to the Real Madrid football club. The suffix '-ismo' transforms the place name into an ideology or cultural identity, similar to how English uses '-ism' to create words about beliefs or movements.

The most obvious related Spanish word is simply 'Madrid', the name of Spain's capital city. Other Spanish words using the same suffix '-ismo' include 'optimismo' (optimism), 'turismo' (tourism), and 'socialismo' (socialism), all of which follow the same pattern of forming nouns that describe systems of belief, practice, or cultural phenomena.

While 'Madrid' itself has been borrowed into English as is, the Latin root 'matrix' has given English several related words. 'Matrix' itself exists in English, meaning a mathematical array or an environment that contains or develops something. 'Maternal' and 'matric-' words (like 'matriculate') also share this Latin ancestor, all connecting to the original meaning of 'womb' or 'source'. The suffix '-ism' in English is cognate with Spanish '-ismo', both being used to form words about beliefs, systems, or movements.