ammonoid adjective 1noun 1forms 3 adjective1 •Characteristic of an ammonite.Literally tens of pence with an ammonoid fossil to highlight how bling bling the world of palaeontology has become — 2016 noun1 •An extinct cephalopod of the subclass †Ammonoidea (including ammonites). formsammonoids · more ammonoid · most ammonoid
