1. The thin transparent part of the blood; the thin part of milk; whey.

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

• sqerm,
• ceram,
• strim,
• sfrom,
• strom,
• sevem,
• serus,
• ferom,
• sesume,
• shrim,
• seruge,
• furum,
• resum,
• sarum,
• sterum,
• sercum,
• surcum,
• heram,
• jerom,
• suruf

• Serrano.

The adjective form of the word "serum" is "serous".