Sentence:  ( 3 ) For anionics , these micelles appear to be roughly spherical assemblages in which the hydrocarbon tails come together so that the polar <WSD>groups</WSD> ( the ionized ends ) face outward towards the aqueous continuous phase . 
Meaning of the word marked with <WSD> tags:  (chemistry) two or more atoms bound together as a single unit and forming part of a molecule