-hedrycomb. form

Primary stress is attracted to the first syllable of this combining form and vowels may be reduced accordingly; see e.g. 
merohedry n.Origin: A borrowing from German. Etymon: German -edrie.
Etymology:  <  German -edrie (1825 or earlier in Homoedrie  , Homiedrie  , and a number of other formations)  <  Hellenistic Greek -εδρος   (see -hedron comb. form) + German -ie  -y suffix3. Compare -hedrism comb. form.Found in a small number of formations from the 19th cent., apparently earliest in hemihedry n. at hemihedron n. Derivatives   and tetartohedry n. at tetarto- comb. form 1.
This is a new entry (OED Third Edition, November 2010; most recently modified version published online March 2022).