Category: O
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Ovate
Egg-shaped (2-dimensional), about 1.5 x as long as broad, with the wider part below the middle. Shaped like a long section through a hen’s egg, with the larger end toward the base. Broader part at the end of the base. Egg-shaped, with the broader end at the base. Egg shaped; widest below the middle. Oval…
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Oval
Broadly elliptic, the length less than twice the width. A broad ellipse, with both ends the same width. Broadly elliptical or egg-shaped. Concerning an ovum, the reproductive cell of the female.
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Outgroup
(In cladistics) a group that is not included in the group under study and which is used for comparative purposes.
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Outcross
Cross in which pollen from one plant fertilises another plant.
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Outbreeding
Producing offspring by crossfertilisation. The mating of individuals who are not closely related. The production of offspring by parents who are not closely related. The mating of unrelated (or very distantly related) members of a species. It is the opposite of inbreeding.
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Ostiole
Mouth; for example, the aperture at the apex of a fig (the compound fruit of species of Ficus).
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Ostiolar
Of the mouth (e.g. ostiolar bracts are those at the ostiole of a Ficus fruit).
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Ossiculus
The hard pit of a stone fruit.
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Orthotropous
(Of ovule or seed) with a straight axis, the base of the nucellus proximal, the micropyle distal. Said of an ovary when its point of attachment is at its base and the apex is in direct line with it.
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Orthotropic
(Of shoot) vertical; distinct from plagiotropic.