This is the 5391st most frequent Spanish word.
micro
"Micro" in Spanish refers to a "microphone" or colloquially to a "bus" (in some Latin American countries).
In this context, 'micro' is used as a colloquial term in some Spanish-speaking countries, particularly Chile, to refer to a public bus.
Hoy tomé la micro para ir al trabajo.
Today I took the bus to go to work.
Here, 'micro' is used as a prefix in the word 'microondas,' which directly translates to 'microwave,' denoting the appliance.
Compré un microondas nuevo para la cocina.
I bought a new microwave for the kitchen.
In this sentence, 'micro' is used as an adjective prefix to indicate something very small, here referring to organisms that can only be observed under a microscope.