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abstract	hard to understand because not based on one's experience of the world. [1/3 definitions]
achene	a small, dry, hard seed that is attached at a single point and that does not split open when it is mature.
achieve	to get by trying hard. [1/2 definitions]
achievement	something that is completed with success using hard work or skill.
adamant	any extremely hard, unbreakable, or impenetrable substance. [1/3 definitions]
addict	to cause to depend on something that is hard to give up. [1/3 definitions]
adjective	a word that describes a noun or pronoun. In the sentence, "It was a hard test," the word "hard" is an adjective. It describes the noun "test."
alabaster	a hard, white stone that is often translucent. Alabaster is often carved to make statues and ornaments. [1/2 definitions]
alligator	a large reptile with short legs, a long body and tail, and a long, wide snout. Alligators are protected by thick skin with many hard bumps. They live in rivers, lakes, swamps, and other bodies of water in the southeast United States and in China. They usually eat insects, fish, turtles, snakes, birds, and other water animals, but have been known to attack small land mammals. They are closely related to crocodiles. Chinese alligators are endangered because their habitat is being changed by people.
almond	the hard oval seed of this tree that is like a nut and eaten as food. [1/3 definitions]
amazonite	a moderately hard, green form of microcline, sometimes used as a gemstone.
amber	a hard, yellow or brown material that is used to make jewelry. It is a fossil that comes from the resin of pine trees. [1/2 definitions]
amyloid	a result of the degeneration of body tissue, occurring in the form of a hard waxy protein deposit. [1/3 definitions]
ankylosis	the joining or growing together of bones or other hard tissues. [1/2 definitions]
anthracite	a hard, shiny coal that burns with little flame or smoke.
antimony	a chemical element that has fifty-one protons in each nucleus and forms a brittle bluish white metal crystal, used in hard alloys, electrical components, and medicines. (symbol: Sb)
applejack	an alcoholic beverage made from hard cider; apple brandy.
armadillo	a mammal whose body is protected by hard, bony plates. Armadillos live in Central and South America, and the southern United States. Some kinds of armadillos are only six inches long; other kinds grow up to four feet in length. They eat mostly insects and are related to sloths and anteaters.
arthropod	a large group of animals with hard shells on the outsides of their bodies, legs with joints, and no bones inside their bodies. Insects, spiders, centipedes, and crabs are arthropods.
asphalt	a black, sticky substance that is mixed with small rocks and becomes hard. People use asphalt to make roads.
a tough nut to crack	a person who is hard to understand, know well, or convince. [1/2 definitions]

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