Sentence:  Her sturdy stallion had now unbutton'd, and produced naked, stiff, and erect, that wonderful machine, which I had never seen before, and which, for the interest my own seat of pleasure began to take furiously in it, I <WSD>star'd</WSD> at with all the eyes I had 
Meaning of the word marked with <WSD> tags:  To look fixedly (at something).