A thickened, often colorful and tasteful part of the plant that doesnīt belong to the ovarium and fruit.
The most famous case is the cashew. The real fruit is only the shell where the nut is stored. The big, showy, juicy part is the swollen floral receptacle, that takes the responsability of atracting seed dispersors, and not a real fruit - pseudocarp.
Podocarpus, that are gymnosperms and arenīt suposed to produce fruits, have their naked seeds attached to an equally swollen and colorful receptacule that atracts birds that eat it and drop the seeds somewhere else.