Dictionary.com
Thesaurus.com

therophyte

American  
[theer-uh-fahyt] / ˈθɪər əˌfaɪt /

noun

Botany.
  1. a plant living only one year or one growing season.


therophyte British  
/ ˈθɪərəˌfaɪt /

noun

  1. a plant that overwinters as a seed

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of therophyte

< Greek théro ( s ) summer + -phyte