ho Ho • hoar · · · Info · Definitions · Synonyms · Characters · · ho · · Text Latin · · Script 2 · · Length Definitions · · · (noun) a trivalent metallic element of the rare earth group; occurs together with yttrium; forms highly magnetic compounds. Synonyms: holmium, Ho, atomic number 67. · · Noun Definition 1 Synonyms · · · holmium · · Synonym 1 atomic number 67 · · Synonym 2 Characters · · h latin small letter h U+0068 o latin small letter o U+006F