Isn't "gingerbread" more like a cookie than bread? Why would they call it "gingerbread"?

What's "leave out" mean and when's it used?

If you "leave out" someone or something, you exclude them or fail to include them. It can also have the nuance of "overlooking" someone or something- you don't notice them. Ex: Of course you're invited to the party! We'd never leave you out. Ex: I left out the tomatoes 'cause I know you don't like them.

Is it ok to omit "in" from "in which" in this sentence?

Yes, you can! However, you would have to replace "in which" with "is where" for the sentence to make sense. The "in which" in this sentence is a formal way of saying "where." You could change the sentence to "The 'product backlog' is where you list your ambitions and express how you intend to achieve them. Ex: This is the cave in which a rare gemstone was discovered. => This is the cave where a rare gemstone was discovered. Ex: He had a horrible virus in which he started hallucinating. => He had a horrible virus where he started hallucinating.

What does the word "own" mean in this sentence? Is it ok to omit "own" here and say "in our cat's eyes"?

Here, "own" means something that belongs to someone or something mentioned. And, yes! The sentence would make sense and sound natural without "own." Here, "own" functions to emphasize that one's cat belongs to oneself, which is already implied in context as well as with the use of "our" since it indicates possession or association. Ex: The restaurant's own manager quit yesterday! => dramatic tone = The restaurant's manager quit yesterday! Ex: My own brother insulted me. = My brother insulted me.

What’s angio-?

"Angio" is short for "angiogram", which is a medical test that takes pictures of your blood vessels to help make a diagnosis.

Isn't "gingerbread" more like a cookie than bread? Why would they call it "gingerbread"?

Yes. "Gingerbread" is more of a cookie than it is a bread, depending on how it is made. The word "gingerbread" actually derived from Old French meaning preserved ginger. It may have been called "gingerbread" because breadcrumbs used to be used to make it. Throughout the years it then became the gingerbread that we know today, made of honey, cinnamon, cloves, and of course ginger!