in ‧ grow ‧ ing /ˌɪnˈɡrəʊɪŋ◂ $ -ˈɡroʊ-/ BrE AmE British English , in‧grown /-ˈɡrəʊn◂ $ -ˈɡroʊn◂/ American English adjective [no comparative]
an ingrowing ↑ toenail grows inwards, cutting into the surrounding skin
in ‧ grow ‧ ing /ˌɪnˈɡrəʊɪŋ◂ $ -ˈɡroʊ-/ BrE AmE British English , in‧grown /-ˈɡrəʊn◂ $ -ˈɡroʊn◂/ American English adjective [no comparative]
an ingrowing ↑ toenail grows inwards, cutting into the surrounding skin
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012