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Words starting with O

Words that start with O

Orange orangutans avidly ogle an orchard of oleanders in Oregon.

View in the Videographic Dictionary

Animals

Food starting with O

Food

Photo of olives.

Plants

Adjectives that start with O

Adjectives

Countries that start with O

Countries

Photo of an orange

Fruit

Photo of Oslo

Cities

Photo of an ostrich

Birds

Photo of an observatory
Photo by Naotake Murayama
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Ois forObservatory

An observatory is a building that is made as a place to watch the stars and planets. Observatories are dome-shaped and are usually built on top of high mountains so there is less air between them and space.
Structures
Photo of a fragment of obsidian
Photo by John Atherton
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Ois forObsidian

Obsidian is a dark glass formed in the larval flows of volcanos. Obsidian doesn't have a crystalline structure and can be broken into very thin pieces that can be used to make a very sharp cutting edge, spear tip or arrow head.
Stones
Photo of men going through an obstacle course
Photo by 7thArmyJMTC
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Ois forObstacle

An obstacle is something that gets in your way when you are trying to do something or go somewhere.
Photo of the roofline of a wooden building.
Photo by Dan Brady
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Ois forObtuse

An obtuse angle is one that is larger than 90 degrees. A 90 degree angle is a "normal" corner, like you find inside most houses and the corners of a piece of paper. An angle smaller than 90 degrees is called acute.
Maths
Photo of the ocean
Photo by Official Navy Page
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Ois forOcean

The ocean is the vast expanse of salty water that covers most of the Earth. Another word for ocean is sea.
Waterways
Photo of an ocelot
Photo by Eric Kilby
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Ois forOcelot

Scientific name: leopardus pardalis
The ocelot is a wild cat found in South & Central America and Mexico. They look similar to an ordinary cat but have markings on their coat like a jaguar. They live mainly in forested areas and hunt small animals.
Cats
Photo of a stop sign.
Photo by Greg Westfall
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Ois forOctagon

An octagon is a shape with eight sides. The stop sign in the picture is an octagon, and it is mostly red.
Shapes
Photo of a calendar that says October
Photo by plenty.r.
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Ois forOctober

October is the tenth month of the year. It has 31 days. The next month of the year is November. In the northern hemisphere October is part of autumn, and in the southern hemisphere it is part of spring.
Months
Photo of an octopus
Photo by Mrs. Gemstone
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Ois forOctopus

Video: view
An octopus is a creature with eight arms that lives in the sea. The bottom of their arms is covered in suction cups. Most octopi have no bones, so they can squeeze into very small holes to hide. Octopi have three hearts and blue blood. Octopi are distantly related to snails.
Molluscs
Photo of a man wearing odd socks
Photo by Effervescing Elephant
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Ois forOdd

Something is odd if it is different to usual, or is a bit strange. In a group of things, something that is different is called the odd one out. The man in the picture is wearing odd socks. Mathematically, a number is odd if it is not a multiple of two.
Adjectives, Maths