Slang for any generic airplane, the word bird also meaning an airplane.
It is pronounced like other aircraft designations are pronounced: bee-one-are-dee.
"What kind of airplane is that?"
"What kind of airplane is the other one?"
"How can two completely different planes have the same name???"
"To me they are all the same, they're all birds. Go ask a pilot; I fly a desk for the Air Force."
In common usage, the words hypothesis, model, theory, and law have different interpretations and are at times used without precision, but in science they have very exact meanings. A hypothesis is a limited statement regarding the cause and effect in a specific situation, which can be tested by experimentation and observation or by statistical analysis of the probabilities from the data obtained.