serum
n
(pl sera 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.