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tritencephalon
tritencephalon n. 
/ˌtrɪtɛnˈsɛfl̩ɒn/, /ˌtrʌɪtɛnˈsɛfəlɒn/, /ˌtrʌɪtɛnˈsɛfl̩ɒn/,
Brit. /ˌtrɪtɛnˈsɛfəlɒn/
, /ˌtrɪtɛnˈsɛfəlɒn//ˌtrɪtɛnˈsɛfl̩ɒn//ˌtrʌɪtɛnˈsɛfəlɒn//ˌtrʌɪtɛnˈsɛfl̩ɒn/U.S. /ˌtraɪdɛnˈsɛfəl(ə)n/
the third of the three primary cerebral vesicles of the embryo; also, the hindmost segment of the brain of an insect. [ < scientific Latin tritencephalon (1882 or earlier) < trito- trito- comb. form + ancient Greek ἐγκέϕαλος brain (see encephalo- comb. form).] /ˌtraɪdɛnˈsɛfəl(ə)n/ΘΚΠ
the world > life > biology > biological processes > procreation or reproduction > embryo or fetus > embryo parts > [noun] > skull or brain
visceral cleft1870
metencephalon1871
chondrocranium1875
protocerebrum1885
protencephalon1887
parachordal1892
tritencephalon1910
parencephalon1911
the world > animals > invertebrates > phylum Arthropoda > class Insecta > parts of insects > [noun] > compound brain > hindmost segment of
tritocerebrum1898
tritencephalon1910
1910 Encycl. Brit. XIII. 425/2 This anterior or ‘brain’ mass consists of three lobes (the prot-, deut-, and tritencephalon of Viallanes).
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