Definition: The clear yellowish liquid obtained upon separating whole blood into its solid and liquid components after it has been allowed to clot.

Alright class, settle down, let’s take a look, At this word “serum,” a scientific hook! The dictionary's giving you the key, To what "serum" really means for you and me. Let’s break it down in a rhythmic way, So understanding shines bright today! “Clear yellowish liquid,” that’s part one true, It’s found when blood has undergone anew. When we separate the parts, you see, Like solids settling, peacefully. "Whole blood," it starts with, a vibrant hue, Then clotting happens, just for you! After it clots, and settles slow, The clear liquid flows – that’s serum's glow! Think of it like this: imagine a mix, Of red cells, white cells, and plasma tricks. When the solids fall, nice and neat, The yellowish fluid is what we greet! So in short class, let the knowledge flow: "Serum" is the clear liquid left behind, after blood has separated and clotted – a vital part of our body's design! Do you have any questions about this science quest?