Where does “mostrear” come from?

mostrear (Spanish) comes from Spanish muestra, from Spanish mostrar, from Latin mōnstrāre, from Latin monēre.

mostrear (Spanish): to sample

Definitions

Step	Language	Word	Meaning
1	Spanish	muestra	sample, sampling; exhibition; specimen
2	Spanish	mostrar	to show
3	Latin	mōnstrāre	—
4	Latin	monēre	—

mostrear — Etymology, Origin & Word History | Etymology Explorer