Category: O
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Ocrea
(Of a leaf sheath) an extension beyond the petiole insertion (e.g. in palms); A tubular stipule sheathing the stem (e.g. in Polygonum).
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Ochreate
With an ocrea.
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Ochrea, ocrea
From the Latin for ‘greave’, a piece of armour for the shin; preferred spelling is ocrea. A sheath, in leaves an extension along the stem beyond the petiole, in Polygonaceae associated with their fused sheathing stipules. The tubular,± translucent, brown or silvery, membranous stipules, often with a fringed tip, in the Dock family.
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Ocellate
With a spot like an eye (usually a zoological term).
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Obvolute
Overlapping [obscure term].
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Obverse
Turned towards, the side facing.
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Obtuse
(Of an apex or base) not pointed, blunt, ending in an angle of between 90–180°. Blunt or rounded at the apex, the converging edges separated by an angle greater than 90 degrees. Abrupt, that is forming an obtuse angle, or somewhat rounded instead of strictly angular. Apex formed by two lines that meet at more…
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Obtrullate
Obverse of trullate, shaped like a bricklayers trowel.
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Obtriangular
(Of a 2-dimensional shape) like an inverted triangle, i.e. with the narrowest part proximal. Inverted triangular, with the narrow end at the base.
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Obsolete
Not apparent, no longer used, rudimentary.