Sentence:  He thought of Simms Purdew , who once had risen at the edge of a cornfield , a maniacal scream on his <WSD>lips</WSD> , and swung a clubbed musket like a flail to beat down the swirl of Rebel bayonets about him . 
Meaning of the word marked with <WSD> tags:  either of two fleshy folds of tissue that surround the mouth and play a role in speaking