The Spanish word 'impregnado' (meaning 'impregnated' or 'saturated') comes from the Spanish verb 'impregnar', which in turn derives from Latin 'impraegnare' meaning 'to impregnate'. The Latin word was formed by combining the prefix 'in-' (meaning 'in, into') with 'praegnare' (meaning 'to make pregnant'). This combination created a word that literally meant 'to make something pregnant' or 'to put something into', which evolved to mean saturating or filling something completely with a substance.

A simpler related Spanish word is 'preñada' (meaning 'pregnant'), which comes from the same Latin root 'praegnare'. While 'impregnado' took on a more general meaning of being saturated with something, 'preñada' retained the original meaning related to pregnancy.

The English words 'impregnate' and 'pregnant' are closely related to 'impregnado', all sharing the same Latin origins. 'Impregnate' follows almost the same etymology through Latin 'impraegnare', while 'pregnant' comes from Latin 'praegnare'. Just as in Spanish, the English 'impregnate' can be used both literally (to make pregnant) and figuratively (to saturate something completely).