Sentence:  When he turned into the highway that led to the outskirts of the city and then rose toward home , he had to pull over to the curb and wait for a few minutes , sucking in air and squinting and blinking his eyes to clear them of <WSD>tears</WSD> . 
Meaning of the word marked with <WSD> tags:  a drop of the clear salty saline solution secreted by the lacrimal glands