forearm; the span of the outstretched arms
Latin word, found 32 times in the texts on Socratos.
Vergil, Eclogues 3.105: tris pateat caeli spatium non amplius ulnas.
Ovid, Metamorphoses 7.847: invenio, corpusque meo mihi carius ulnis
Catullus, Carmina lyrics.17.13: bimuli tremula patris dormientis in ulna:
All forms of ulna