third trimester third tonsil • third ventricle · · · Info · Definitions · Characters · · third trimester · · Text Common · · Latin · · Scripts 15 · · Length 4 · · Syllables Definitions · · · (noun) time period extending from the 28th week of gestation until delivery. Synonyms: third trimester. · · Noun Definition 1 Characters · · space U+0020 d latin small letter d U+0064 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 m latin small letter m U+006D r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074