资料来源 : pyDict

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资料来源 : Webster's Revised Unabridged Dictionary (1913)

Senonian \Se*no"ni*an\, a. [F. s['e]nonien, from the district of
   S['e]nonais, in France.] (Geol.)
   In european geology, a name given to the middle division of
   the Upper Cretaceous formation.