The plural of haematozoon; multiple parasitic organisms found in blood.
From Greek 'haima' (blood) + 'zoa' (plural of zoon, meaning animals). This is simply the plural form of haematozoon, following standard Greek pluralization patterns.
Medical researchers in the 1800s were shocked to discover these creatures moving around in blood—it explained why people got sick in certain tropical regions.
Complete word intelligence in one call. Free tier — 50 lookups/day.