Wordnet 3.0
NOUN (1)
1.
something that grows inward;
The Collaborative International Dictionary of English v.0.48:
Ingrowth \In"growth`\, n.
A growth or development inward. --J. LeConte.
[1913 Webster]
WordNet (r) 3.0 (2006):
ingrowth
n 1: something that grows inward