Found:
Referential opacity
MORPHOLOGY: a property of words which entails that it is impossible to
'see inside' them, and refer to their parts by using an anaphoric device such as
a pronoun.
EXAMPLE: there cannot be an anaphoric relation between it and
tea in the compound teapot. Therefore, if the sentence he
took the teapot and poured it into the cup means that he poured the tea into
the cup, the fact that it refers to the tea does not arise through the
anaphoric relation that is possible in he took the tea and poured it into the
cup. Referential opacity is closely related to the property of
lexical integrity.