I was playing this spelling bee game when this word came up and I wanted to know how the word was formed but could not find anything and thought perhaps someone on this site could help me out a bit?
According to wikipedia:
Pfiesteria was discovered in 1988 by North Carolina State University researchers JoAnn Burkholder and Ed Noga. The genus was named after Lois Ann Pfiester (1936–1992), a biologist who did much of the early research on dinoflagellates. An in-depth story of the discovery can be found in And the Waters Turned to Blood by Rodney Barker.
According to Dictionary of American Family Names, Oxford University Press:
Pfiester; German: variant of Pfister.
And, again, according to Dictionary of American Family Names, Oxford University Press:
Pfister; South German and Swiss German: occupational name for a baker, from Middle High German pfister ‘baker’ (from Latin pistor).
From And the Waters Turned to Blood by Rodney Barker, p. 103:
"Pfiesteria was a tribute to their friend the late Lois Pfiester, a pioneer in unraveling the sexual life cycles of fresh-water dinoflagellates..."