noun. Well, they are adorable.
Related words: tree-hugger, panda-hugger, caribou-hugger, lung-hugger, Bill-of-Rights-hugger, Constitution-hugger, habitat-hugger.
Real citation: "TAKE THAT STEM CELL HUGGER"
(quietgirl, Dec. 16, 2005, http://www.airamerica.com/ms/node/1103?from=360&comments_per_page=90)
Made-up citation: "I can't blame stem-cell-huggers for their strong beliefs. Paul's 'Letter to the Stem Cells' is very persuasive."