The word has 13 letters.
The 1st letter starts the alphabet;
the 2nd letter sounds like "to be" in the present tense, plural form;
the 3rd letter is the same that starts this word and ends this word;
the 4th letter sounds like sea;
the 5th letter is the eighth letter of the alphabet;
the 6th letter you can find in a minute and a century, but not in a year nor a day;
the 7th letter is hidden in the water formula;
the 8th letter starts the word that means father and mother;
the 9th letter has already been used;
the 10th letter looks like a doughnut;
the 11th letter you will find in "Bumble Bee" and "Lady Bug";
the 12th letter sounds like what you see with in a singular form;
and you already know the 13th letter.
Did you find the word?
Do you know what it means?