siˈmulˈtaˈne-ous (sīˈmŭlˈtāˈne᷵-ŭs), existing, happening, or done, at the same time.

sinˈew (sĭnˈū), cord, tendon.

sinˌgu-larˈi-ty (sĭnˌgu᷵-lărˈĭ-tĭ), peculiarity.

sinˈis-ter (sĭnˈĭs-tẽr), evil.

sinˈu-ous (sĭnˈu᷵-ŭs), winding.

sire (sīr), an older person, elder.

siˈren (sīˈrĕn), one of a group of sea nymphs who lured sailors to destruction by their singing.

sixpence (sĭksˈpĕns), a small British coin, six pennies, or twelve cents.

Skald (skôld), a Scandinavian poet who sings of the heroic deeds of his people.