• WordNet 3.6
    • adj orthotropous (of a plant ovule) completely straight with the micropyle at the apex
    • ***
Webster's Revised Unabridged Dictionary
    • a Orthotropous (Bot) Having the axis of an ovule or seed straight from the hilum and chalaza to the orifice or the micropyle; atropous.☞ This word has also been used (but improperly) to describe any embryo whose radicle points towards, or is next to, the hilum.
    • ***
Century Dictionary and Cyclopedia
    • orthotropous In botany, growing vertically or straight: applied specifically to an ovule in which the chalaza is at the evident base, and the orifice at the opposite extremity, the whole ovule being straight and symmetrical. The ovules of the Polygonaceæ, Urticaceæ, etc., are examples. Better atropal (which see). Also applied to an embryo in which the radicle is directed to the hilum or to the micropyle close to the hilum, as in an anatropous ovule. In the latter sense the same as homotropous.
    • ***


Webster's Revised Unabridged Dictionary
Ortho-, + Gr. to turn: cf. F. orthotrope,


In literature:

Section of seed of Rock Rose, Helianthemum Canadense; orthotropous, with curved embryo in the albumen.
"The Elements of Botany" by Asa Gray
Ovary 1-celled; ovule erect, orthotropous.
"The Manual of the Botany of the Northern United States" by Asa Gray

In science:

We here consider the case of more general, tensor–valued models of the permeability, which are often used in applications to model orthotropic media.
Multilevel Monte Carlo methods for highly heterogeneous media
It is rather an orthotropic system in which the properties are the same in the (Ox) and (Oy ) directions parallel to the interface but different in the (Oz ) direction perpendicular to the interface.
Influence of Elastic Strains on the Adsorption Process in Porous Materials. An Experimental Approach
The rock mass geometry illustrated in this figure reveals the presence of two main sets of fractures, whose geometrical and mechanical properties are listed in Table 2. The geometry indicates that the rock mass exhibits orthotropic behaviour in directions 1, 2 and 3.
Ellipsoidal anisotropy in elasticity for rocks and rock masses
This result is promising and suggests application of the ellipsoidal model to fit numerical data. The 3D model Ψ with four parameters was chosen for this purpose. Parameters E1, E2 and E3, which correspond to the three orthotropic directions, can be deduced directly from Table 3 results.
Ellipsoidal anisotropy in elasticity for rocks and rock masses