Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
prīmĭpăra, ae, f. [primus-pario], she that has brought forth, foaled, whelped, littered, etc., for the first time; of animals (post-Aug.), Plin. 8, 40, 62, § 151; 8, 47, 72, § 187: sus, id. 11, 37, 84, § 210.