seul, -e, alone, only; tout --, all by itself.
seulement, only; not till; non -- ... mais, not only ... but.
si, if, whether; so, so much; after a negative, yes.
siècle, m., century.
sifflement, m., whistling.
siffler, to whistle, whistle to.
signe, m., sign; d'un -- de tête, with a nod.
silencieu-x, -se, silent.
Silésie, f., Silesia, a southeastern province of Germany bordering on Austria.
sillon, m., furrow.