intercalary

Etymology

From Latin intercalārius, from intercalāris, from intercalō, from inter (“among”) + calō (“call out, proclaim”).

adj

1. Describing a time period inserted between others; leap, (as in leap day, leap month, or leap year)
2. (sciences, by extension) Inserted between other things
   1. (botany) of a meristem: situated between zones of permanent tissue, thus a shoot growing at the base of a leaf, in comparison with apical growth at the tip of a root or plant.
   2. (entomology) of a wing vein: between the major veins common to insect wings.
      ...two radial cells, second longer than first; intercalary fork fairly distinct; crossvein r-m vertical... 1953, Willis W. Wirth, “American Biting Midges of the Helid Genus Monohelea”, in Proceedings of the United States National Museum, volume 103, number 3320, pages 135–154

noun

1. Such a time period