diaphysis diaphysial • diaplasma · · · Info · Definitions · Synonyms · Characters · · diaphysis · · Text Latin · · Script 9 · · Length Definitions · · · (noun) the main (mid) section of a long bone. Synonyms: shaft. · · Noun Definition 1 Synonyms · · · shaft · · Synonym 1 Characters · · a latin small letter a U+0061 d latin small letter d U+0064 h latin small letter h U+0068 i latin small letter i U+0069 p latin small letter p U+0070 s latin small letter s U+0073 y latin small letter y U+0079