Noun
A growth or development inward.
Source: Webster's dictionaryEvery gland is formed by an ingrowth from an epithelial surface. Source: Internet
Therefore, given sufficient time for significant production (ingrowth) of radiogenic 87 Sr, measured 87 Sr/ 86 Sr values will be different in the minerals, increasing in the same order. Source: Internet
This ingrowth may in the beginning possess a tubular structure, but in other instances glands may start as a solid column of cells which subsequently becomes tubulated. Source: Internet