rarefy russian

• разреди́ть

  to thin out, to thin, to clear (of undergrowth)

  to space out, to make less frequent

  to rarefy, to make thinner (of air)

• разрежа́ть

  to thin out, to thin

  to rarefy, to thin (air or gas)

  to space out, to make less frequent

• разрежа́ющий

  rarefying, thinning (out), diluting

• разрежа́вший

  thinning (out), rarefying, making less dense, diluting