1. precover - Noun
2. precover - Verb
(mathematics) A generalization of a cover in which the kernal may contain a non-zero pure subgroup.
Something that occurs in preparation for a covering.
precover (third-person singular simple present precovers, present participle precovering, simple past and past participle precovered)
(astronomy) To find an older image of an object in archived images after it has been discovered.