precover

pre- +‎ cover

precover (plural precovers)

1. (mathematics) A generalization of a cover in which the kernal may contain a non-zero pure subgroup.
2. Something that occurs in preparation for a covering.
   • 1957, Canada Dept. of Agriculture Research Station, Kentville, N. S., Research Report, page 19:

     Zineb did not give good control as a precover spray but as a cover spray it gave excellent control of late and storage scab.

   • 1959, Annual Report of the Canadian Plant Disease Survey:

     Excellent control of a storage rot of apples, caused by Gloeosporium album, was obtained with an orchard spraying program of captan in the precover followed by 3 regular and 2 late cover sprays of captan or a mixture of captan and zineb.

   • 2001, Oregon Administrative Rules - Volume 6, page 11:

     At the discretion of the Agent, the permittee may be assessed a reinspection fee, not to exceed $235, when a precover inspection correction notice requires correction of improper construction and, at a subsequent inspection, the Agent finds system construction deficiencies have not been corrected.

pre- +‎ discover

precover (third-person singular simple present precovers, present participle precovering, simple past and past participle precovered)

1. (astronomy) To find an older image of an object in archived images after it has been discovered.

• precovery