serum

n (pl sera / 5sIErE; `sIrE/ or ~ s) (medical 医) 1 [U] (a) watery liquid in animal bodies （动物体内的）浆液. (b) thin yellowish liquid that remains from blood after it has clotted 血清. 2 [C, U] (dose of) such liquid taken from an animal that is immune to a disease, used for inoculations （一剂）免疫血清（用於接种或预防注射）. Cf 参看 vaccine.

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