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tachygen
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tachygen n. 
/ˈtakᵻdʒ(ə)n/, /ˈtækədʒən/ Biology the sudden appearance of an organ in evolution; the part so appearing (Webster Suppl. 1902). [ < tachy- comb. form + -gen comb. form.]
Brit. /ˈtakᵻdʒɛn/
, /ˈtakᵻdʒɛn//ˈtakᵻdʒ(ə)n/U.S. /ˈtækəˌdʒɛn/
, /ˈtækəˌdʒɛn//ˈtækədʒən/<
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