Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ĭmĭtāmen, ĭnis, n. [imitor], imitation; abstr. and concr., a resemblance, likeness, imitation, image (Ovidian): somnia, quae veras aequent imitamine formas, Ov. M. 11, 626.
In plur.: artes, antiquae imitamina vitae, Ov. M. 4, 445: aetatis peragens imitamina nostrae, id. ib. 15, 200; id. F. 4, 211.