芽生 is read as がせい (gasei) and means gemmation.
がせい
gasei
めばえ
bud
めばえる
to arise
め
germinal disk (in an egg)
めぶく
to bud
がじょうへんい
bud mutation
めだし
sprouting
めがでる
to have luck on one's side
めをだす
to sprout
めだち
がたい
blastema
がきゅう
blast (cell)
えいせい
hygiene