foster-son foster-sister • fosterable · · · Info · Definitions · Synonyms · Characters · · foster-son · · Text Common · · Latin · · Scripts 10 · · Length 3 · · Syllables Definitions · · · (noun) someone who is raised as a son although not related by birth. Synonyms: foster son. · · Noun Definition 1 Synonyms · · · foster son · · Synonym 1 Characters · · - hyphen-minus U+002D e latin small letter e U+0065 f latin small letter f U+0066 n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074