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Ob-

Prefix meaning inversely.

Obconic

A solid figure with the shape of a cone; widest at the apex and pointed at the base.

Oblique

Unequal sides; slanting.

Oblong

Object with round ends and parallel margins, three times longer than wide.

Obovate

Egg-shaped with widest part above the middle.

Obovoid

A solid that is obovate in outline.

Obpyriform

Pear-shaped, with the wide end toward the apex.

Obtuse

Pointed with an angle greater than 90^o. A broad pointed apex or base.

One-sided

Secund; arranged only on one side.

Open

Loose, spreading (e.g., inflorescences, with few spikelets and long branches).

Opposite

Structures that are paired at the nodes and placed one on each side of the node; stamen inserted directly in front of the petal; leaves are also opposite.

Orbicular

Approaching a circular outline.

Oval

Broadly elliptical but with rounded ends; similar to oblong, but not as long.

Ovate

Egg-shaped with the widest part below the middle

Ovulate

Bearing ovules.

Ovule

The structure within the ovary that will become the seed after fertilization.