Having a small beak-like projection; having a rostrum or rostellum.

Originally (of an embryo): having the radicle directed towards the hilum; = homotropous, adj. Later (of an ovule): developed in an upright position…

Botany. = peritropous, adj. rare.

Botany. Designating the radicle of a plant embryo or seedling; of or relating to this.

Of a (small) part: shaped like a beak. Cf. rostellum, n.

Of the embryo of a seed: Having the radicle directed towards the hilum. Opposed to antitropous or heterotropous.

= hemitropous, adj. 2.

= heterotropous, adj.

Belonging to the axis; (Botany) applied to an embryo having the same direction as the axis of the seed, or a placenta in the axis of the ovary.

= amphitropal, adj.

= homotropous, adj.

Of, relating to, or situated on a rostellum (in various senses). Cf. rostellate, adj.

Of an embryo: So curved as to have both apex and radicle presented to the hilum.

Of a seed or embryo: attached by a central hilum; (also) having its axis perpendicular to that of the fruit; lying horizontally.

= polyembryonic, adj. 1.

Botany. Of a seed: containing more than one embryo.

of, relating to, or of the nature of a proembryo.