Basilinna is a special word used to describe a type of queen bee. Just like how people have special titles for important jobs, like President or CEO, beekeepers use the word basilinna to show that the queen bee is the most important bee in the whole hive.
When a queen bee is born, she grows up and does some very important things for the hive. She lays eggs, which turn into baby bees, and she helps to keep all the other bees in line and working together.
The other bees in the hive take care of the queen bee and make sure she has everything she needs to do her job. They even build her a special little room called a cell, where she can live and lay her eggs.
So, basilinna is just a fancy word for a really important queen bee who is the boss of the whole hive and helps keep everyone working together.