Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
plācāmen, ĭnis, n. [placo], a means of pacifying or appeasing, a lenitive: caelestis irae placamina, Liv. 7, 2, 3: duc praedicta sacris duro placamina Diti, Sil. 13, 415; cf. placamentum.