2nd 3rd optional. FDA has announced an official date of 2010-06 when they will accept submissions to 3 rd edition. The 3 rd Edition will be Mandatory 2013-06-01. Health Canada has announced a mandatory date of 2012-06-01. The EU date of 2012-06-01 has been published in the Official Journal.
I don't know what you mean by root word. Lipo - is the root for fat and used often at the molecular level. Adipose - is the word for fat tissue. fat: <biochemistry> A triglyceride (lipid) that is usually solid at room temperature. http://www.americanheart.org/presenter.j...
(source also of Greek piduein to gush forth), from root *peie- to be fat, swell (source also of Sanskrit payate swells, exuberates, pituh juice, sap, resin; Lithuanian pienas milk; Greek pion fat; wealthy; Latin pinguis fat). Meaning abounding in comforts, prosperous is late 14c. Teen slang meaning attractive, up to date (also later ) is attested from 1951. Fat cat privileged and rich person is from 1928; fat chance no chance at all attested from 1905, perhaps ironic (the expression is found earlier in the sense good opportunity).