mostrar
/mosˈtɾaɾ/ · A1 · verb
to show
🖼️ mostrar ≈ de-MONSTR-ate: both from Latin monstrare, to show
Latin monstrare (to point out, show) gave Spanish mostrar and English demonstrate. Drop the de- and the n, and demonstrate shrinks to mostrar. A muestra (sample) is the thing you show.