It's using the completely correct biology usage: "a similarity of form or structure between organisms"

Thinking it only refers to one field and is wrong - when the usage is totally correct (and very applicable) just makes you sound snobbish... and foolish.

I don't disagree, I come from a maths background so it's a bit weird too; however, I'm yet to see a decent alternative and it's rather entrenched now. It's not a good descriptor however: using the word with non-tech product owners makes their eyes glaze over, so I'd love something better but am yet to come across it.