Twining or Twinning: How To spell?
The word Twining is misspelled against Twinning, a noun meaning "The assemblage of two or more crystals, or parts of crystals, in reversed position with reference to each other in accordance with some definite law; also, rarely, in artificial twinning (accomplished for example by pressure), the process by which this reversal is brought about."
Twinning has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings twi & ing which should not be misspelled with single 'N'
Wrong Spelling:  twi-n-ing  Correct Spelling:  twi-nn-ing 
Find more wrongly spelled words of Twinning to spell it well.