Now as maf indicated earlier, adding those last couple of words made all the difference.
I added it after seeing it was a problem to guess that sole "pip", but normally we don`t say them, pip is enough.
I think it was also the translation of pestka as 'pip' that made it hard for me...
Yes, I was looking for and hesitating over a proper word for about 5 minutes.
Apples, oranges and lemons have pips, while peaches, cherries,plums and mangoes have stones for exampe.
Very interesting, I will surely remember it now. The beneficial effect of the forums. :)
PS. I must know vocabulary because students constantly enquire how to say sth in English. Rarely am I at a loss. :) Fortunately, they haven`t asked about seeds in fruit yet.to be salt in sb`s eye