*serviteur*, m., servant.
*seuil*, m., threshold.
*seul*, alone, single, only.
*seulement*, only, merely, just.
*sévère*, severe, stern.
*si*, conj., if. —— ce n'est, except. adv., so, however.
*le sien*, his.
*sifflement*, m., whistling, whizzing.
*siffler*, to whistle.
*signe*, m., sign. faire ——, to beckon. il lui faisait —— que, he gave him to understand that.