- Botany. (of an ovule) straight and symmetrical, with the chalaza at the evident base and the micropyle at the opposite extremity.
Origin of orthotropous
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Examples from the Web for orthotropous
Orthotropous ovule of Buckwheat: c, hilum and chalaza; f, orifice.
Fruit a kind of dry drupe, with a crustaceous or bony nut-shell, containing a large 4-lobed orthotropous seed.
Orthotropous or Straight, those which develop without curving or turning, as in Fig. 344.
- (of a plant ovule) growing straight during development so that the micropyle is at the apexCompare anatropous
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