Answer: leucocytes

AnswerCrossword Clue
leucocytesLEUCOCYTE, a colourless corpuscle, as one of the white blood corpuscles also LEUKOCYTE
leucocytesA colorless cell that circulates in the blood and body fluids and is involved in counteracting foreign substances and disease; a white (blood) cell. There are several types, all ameboid cells with a nucleus, including lymphocytes, granulocytes, monocytes, and macrophages