Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† prŏpŏlis, is, f., = πρόπολις, the third foundation in making honey, a gummy substance with which the bees close the crevices of their hives, bee-glue, propolis: propolin vocant, quod apes faciunt ad foramen introitus protectum in alvum, maxime aestate, Varr. R. R. 3, 16, 23: prima fundamenta comosin vocant periti, secunda pissoceron, tertia propolin, Plin. 11, 7, 6, § 16; 22, 24, 50, § 107; Gell. 5, 3, 4.