etymology of phosphatidates and phosphatidic acid
Apparently, "phosphatidate" is from "phosphate" + "-ide" + "-ate".

The word "phosphatidic acid" is from "phosphate" + "-ide" + "-ic acid".

Phosphate ($\ce{PO4^3-}$) is the anion of phosphoric acid ($\ce{H3PO4}$).

The suffix "-ide" is used in biochemistry to just about anything. It just denotes an element of a group of related compounds.

Now, "-ate" and "-ic acid" denotes the acidic nature of the compounds.



And no, it is not related to the English word "fat".