embrio

1. Croat. (biology) embryo
   Embrio se razvija u materici nekoliko nedelja. — The embryo develops in the uterus for several weeks.
2. Croat. (of a beginning) embryo; germ
   Taj klub je bio embrio buduće stranke. — That club was the embryo of the future party.

In Serbia: embrion; the form embrio is found in Croatian sources. Figuratively usually u embrionu 'in its infancy'.