noun, masculine/ˈbao/plural: vahos
vapor, mist; whiff; breath
“Levanta la cabeza, limpia un poco el vaho del cristal y mira para ver si hay alguien fuera.” — He looks up, cleans a bit of the mist off the glass and looks to see if there's anyone outside.
Synonyms: neblina, hálito, aliento
From the onomatopoeic word baf.