Any process that stops, prevents, or reduces the frequency, rate or extent of photoreceptor cell differentiation. An example of this process is found in Drosophila melanogaster.
Synonyms:
exact_synonym:
down regulation of photoreceptor cell differentiation; down regulation of photoreceptor differentiation; downregulation of photoreceptor cell differentiation; downregulation of photoreceptor differentiation; negative regulation of photoreceptor differentiation
narrow_synonym:
inhibition of photoreceptor cell differentiation; inhibition of photoreceptor differentiation