a.

1. （胎兒）能養活的；（卵等）能發育的
2. 可實行的

adj.

1. capable of working successfully; feasible.
2. Biology  (of a plant, animal, or cell) capable of surviving or living successfully.
   ▸Botany  (of a seed or spore) able to germinate.
   ▸Medicine  (of a fetus or unborn child) able to live after birth.