orthotropous

[ awr-tho-truh-puhs ]

adjective

1. Botany. (of an ovule) straight and symmetrical, with the chalaza at the evident base and the micropyle at the opposite extremity.

orthotropous

/ ɔːˈθɒtrəpəs /

adjective

1. (of a plant ovule) growing straight during development so that the micropyle is at the apex Compare anatropous

Word History and Origins

Origin of orthotropous¹

From the New Latin word orthotropus, dating back to 1820–30. See ortho-, -tropous

Example Sentences

Ovules very numerous, scattered over the walls, orthotropous.

From Project Gutenberg

Having the ovule inverted at an early period in its development, so that the chalaza is as the apparent apex; Ð opposed to orthotropous.

From Project Gutenberg

The female flower is enveloped in a closely fitting sac-like investment, which must be regarded as a perianth; within this is an orthotropous ovule surrounded by a single integument prolonged upwards as a beak-like micropyle.

From Project Gutenberg

Section of seed of Rock Rose, Helianthemum Canadense; orthotropous, with curved embryo in the albumen. 430a.

From Project Gutenberg

Fruit a 3-celled berry, with 1–2 pendulous orthotropous seeds in each cell.

From Project Gutenberg