Language Quiz / 'O' by Definition

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Can you identify the 'O' words, given their definitions?

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The adult castrated male of the genus Bos, used chiefly as a draft animal
A mineral, an amorphous form of silica, SiO2 with some water of hydration, found in many varieties and colors, including a form that is milky white
The fruit of the evergreen tree, Olea europaea, eaten as a relish and used a source of oil
Far advanced in the years of one's or its life
Having the shape of an ellipse or ellipsoid
The traditional Japanese art or technique of folding paper into a variety of decorative or representational forms, as of animals or flowers
Eggs beaten until frothy, often combined with other ingredients, as herbs, chopped ham, cheese, or jelly, and cooked until set
A unit of weight equal to 437.5 grains or 1/16 pound (28.35 grams) avoirdupois
A place or building equipped and used for making observations of astronomical, meteorological, or other natural phenomena, especially a place equipped with a powerful telescope
A large, long-armed anthropoid ape, Pongo pygmaeus, of arboreal habits, inhabiting Borneo and Sumatra
The power or right of choosing
The first and lowest whole number, being a cardinal number; unity
The curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun
A musical instrument constituting of one or more sets of pipes sounded by means of compressed of air, played by means of one or more keyboards
A cereal grass, Avena sativa, cultivated for its edible seed
The killer whale
A chamber or compartment, as in a stove, for baking, roasting, heating, drying, etc.
Any of a large class of substances typically unctuous, viscous, combustible, liquid at ordinary temperatures, and soluble in ether or alcohol but not water
Contrary or radically different in some respect common to both, as in nature, qualities, direction, result, or significance
Any of several edible, marine, bivalve mollusks of the family Ostreidae, having an irregularly shaped shell, occurring on the bottom or adhering to rocks or other objects in water
An agency through which a prophecy is transmitted
A polygon having eight angles and eight sides
A plant, Allium cepa, of the amaryllis family, having an edible, succulent, pungent bulb
A room, set of rooms, or building where the business of a commercial or industrial organization or of a professional person is conducted
Very fat; corpulent
The line by which a figure or object is defined or bounded; contour
A colorless, odorless, gaseous element constituting about one-fifth of the volume of the atmosphere with atomic number 8
Any of several aquatic, furbearing, weasellike mammals of the genus Lutra and related genera, having webbed feet and a long, slightly flattened tail
A color between yellow and red in the spectrum, an effect of light with a wavelength between 590 and 610 nm; reddish yellow
Any of numerous, chiefly nocturnal birds of prey, of the order Strigiformes, having a broad head with large, forward-directed eyes
Any octopod having a soft, oval body and eight sucker-bearing arms, living mostly at the bottom of the sea
The vast body of salt water that covers almost three fourths of the earth's surface
A large, two-toed, swift-footed flightless bird, Struthio camelus, indigenous to Africa and Arabia, domesticated for its plumage
A long shaft with a broad blade at one end, used as a lever for rowing or otherwise propelling or steering a boat

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