Pseudo-nitzschia
noun
Pseu·do-nitzsch·ia
| \ ˌsüd-ō-ˈnich-ē-ə
\
\
Medical Definition of Pseudo-nitzschia
: a genus of diatoms (order Pennales) including several (such as P. australis and P. pungens) that occur in algal blooms, produce domoic acid, and cause amnesic shellfish poisoning