1. An umbelliferous plant.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• cision,
• vison,
• sicen,
• cison,
• sizen,
• sisan,
• suson,
• soson,
• siaon,
• sizon,
• sis9n,
• sisoj,
• sxison,
• suison,
• siuson,
• sjison,
• sijson,
• sioson,
• s9ison,
• si8son

• siskin,
• Signe,
• sisson,
• sixsome,
• sigyn,
• sign,
• sissom,
• sicken.

The plural form of the word "sison" is "sisons".

The singular form of the word "sison" is "siso"