| 释义 | 
		biennial adjective  /baɪˈeniəl/   /baɪˈeniəl/ [usually before noun]                         jump to other results - happening once every two yearsTopics Timec2
Oxford Collocations DictionaryBiennial is used with these nouns: See full entry Word Originearly 17th cent.: from Latin biennis (from bi- ‘twice’ + annus ‘year’) + -al.  
 biennial noun  /baɪˈeniəl/   /baɪˈeniəl/                           jump to other results - any plant that lives for two years, producing flowers in the second year compare annual, perennialTopics Plants and treesc2
Word Originearly 17th cent.: from Latin biennis (from bi- ‘twice’ + annus ‘year’) + -al.  
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