发育 fāyù to develop
to develop; to mature; growth; development; (sexually) mature
How to remember 发育: 发 send out + 育 nurture = to develop.
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How it is used
- To grow and develop physically, especially of an organism maturing - 身体发育 (shēntǐ fāyù) physical development, 发育良好 (fāyù liánghǎo) well-developed.
- Specifically biological growth/maturation (including puberty), not general 'development'.
- Contrast 发展 (fāzhǎn), which covers abstract growth of things like economies and careers.