Definition of intergrade in English:

intergrade

verb

[NO OBJECT]Biology
  • Pass into another form by a series of intervening forms.

    ‘they have several forms which intergrade with each other’
    • ‘A comprehensive review of the status of those taxa using modern analytic tools has yet to be done, but some taxa appear to intergrade morphologically.’

noun

  • A form resulting from intergrading.

Pronunciation:

intergrade

/ˈɪntəɡreɪd/