ammonoid ammonocarbonous • Ammonoidea · · · Info · Definitions · Synonyms · Characters · · ammonoid · · Text Latin · · Script 8 · · Length 3 · · Syllables Definitions · · · (noun) one of the coiled chambered fossil shells of extinct mollusks. Synonyms: ammonite. · · Noun Definition 1 Synonyms · · · ammonite · · Synonym 1 Characters · · a latin small letter a U+0061 d latin small letter d U+0064 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F