Definition of polytypic in English:

polytypic

adjective

Crystallography

See polytype

‘This procedure helped in making an unambiguous distinction of the dielectric behaviour of the polytypic crystal from that of the corresponding 4H structure.’
‘The most basic branched polytypic crystal that can therefore be produced using these materials is a tetrapod.’

Pronunciation

polytypic

/pɒlɪˈtɪpɪk/