| Words | Parts of Speech | Meaning/Definition/Similar Words |
|---|---|---|
| orang-outang | noun | An arboreal anthropoid ape (Simia satyrus), which inhabits Borneo and Sumatra. Often called simply orang. |
| orbiculation | noun | The state or quality of being orbiculate; orbicularness. |
| orchidaceous | adjective | Pertaining to, or resembling, a natural order (Orchidaceae) of endogenous plants of which the genus Orchis is the type. They are mostly perennial herbs having the stamens and pistils united in a single column, and normally three petals and three sepals, all adherent to the ovary. The flowers are curiously shaped, often resembling insects, the odd or lower petal (called the lip) being unlike the others, and sometimes of a strange and unexpected appearance. About one hundred species occur in the United States, but several thousand in the tropics. |
| ordinability | noun | Capability of being ordained or appointed. |
| ordinaryship | noun | The state of being an ordinary. |
| oregon grape | An evergreen species of barberry (Berberis Aquifolium), of Oregon and California; also, its roundish, blue-black berries. | |
| organization | noun | The act of organizing; the act of arranging in a systematic way for use or action; as, the organization of an army, or of a deliberative body., The state of being organized; also, the relations included in such a state or condition., That which is organized; an organized existence; an organism, an arrangement of parts for the performance of the functions necessary to life. |
| organography | noun | A description of the organs of animals or plants. |
| organoleptic | adjective | Making an impression upon an organ; plastic; — said of the effect or impression produced by any substance on the organs of touch, taste, or smell, and also on the organism as a whole. |
| orichalceous | adjective | Pertaining to, or resembling, orichalch; having a color or luster like that of brass. |
| orientalized | imp. & past participle | of Orientalize |
| originalness | noun | The quality of being original; originality. |
| ornamentally | adverb | By way of ornament. |
| ornithologic | adjective | Alt. of Ornithological |
| ornithomancy | noun | Divination by means of birds, their flight, etc. |
| ornithopappi | noun pl. | An extinct order of birds. It includes only the Archaeopteryx. |
| ornithoscopy | noun | Observation of birds and their habits. |
| orographical | adjective | Of or pertaining to orography. |
| orthoclastic | adjective | Breaking in directions at right angles to each other; — said of the monoclinic feldspars. |
| orthodoxally | adverb | Orthodoxly. |
| orthodoxical | adjective | Pertaining to, or evincing, orthodoxy; orthodox. |
| orthodoxness | noun | The quality or state of being orthodox; orthodoxy. |
| orthodromics | noun | The art of sailing in a direct course, or on the arc of a great circle, which is the shortest distance between any two points on the surface of the globe; great-circle sailing; orthodromy. |
| orthognathic | adjective | Orthognathous. |
| orthogonally | adverb | Perpendicularly; at right angles; as, a curve cuts a set of curves orthogonally. |
| orthographer | noun | One versed in orthography; one who spells words correctly. |
| orthographic | adjective | Alt. of Orthographical |
| orthomorphic | adjective | Having the right form. |
| orthopedical | adjective | Pertaining to, or employed in, orthopedy; relating to the prevention or cure of deformities of children, or, in general, of the human body at any age; as, orthopedic surgery; an orthopedic hospital. |
| orthopterous | adjective | Of or pertaining to the Orthoptera. |
| orthorhombic | adjective | Noting the system of crystallization which has three unequal axes at right angles to each other; trimetric. See Crystallization. |
| orthosilicic | adjective | Designating the form of silicic acid having the normal or highest number of hydroxyl groups. |
| orthotropous | adjective | Having the axis of an ovule or seed straight from the hilum and chalaza to the orifice or the micropyle; atropous. |
| oryctography | noun | Description of fossils. |
| oryctologist | noun | One versed in oryctology. |