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The Collaborative International Dictionary
Interstratify

Interstratify \In`ter*strat"i*fy\, v. t. (Geol.) To put or insert between other strata.

Wiktionary
interstratify

vb. (context geology English) To put or insert between other stratum.

WordNet
interstratify
  1. v. arrange rocks in alternating strata

  2. [also: interstratified]