brain stem brainstem • brain-stem · · · Info · Definitions · Synonyms · Characters · · brain stem · · Text Common · · Latin · · Scripts 10 · · Length 2 · · Syllables Definitions · · · (noun) the part of the brain continuous with the spinal cord and comprising the medulla oblongata and pons and midbrain and parts of the hypothalamus. Synonyms: brainstem, brain-stem, brain stem. · · Noun Definition 1 Synonyms · · · brainstem · · Synonym 1 brain-stem · · Synonym 2 Characters · · space U+0020 a latin small letter a U+0061 b latin small letter b U+0062 e latin small letter e U+0065 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074