If It's White, It's Called a Leukocyte
This page is the CodyCross answer for the clue below from Space Exploration, Group 920, Puzzle 3 (Black Holes).
Question is: If It's White, It's Called a Leukocyte
and the answer is: BLOODCELL
Word Meaning:
BLOOD CELL — (hematology, cytology) Any of the cells normally found in blood, namely erythrocytes and leukocytes, sometimes including the platelets.
Definitions from Wiktionary.