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Noun: interlay  'in-tu(r),ley
  1. An inserted layer of something
    "Patched underlays are used by firms mounting plates extensively on wooden bases but these firms still interlay the plates as well"
Verb: interlay (interlaid)  'in-tu(r),ley
  1. To lay or place among or between

Derived forms: interlaid, interlays, interlaying