CAPIT from the Latin word for "head," caput, turns up in some important places. The head of a ship is its captain, and the capital of a state or country is where the "head of state" works. A capital letter stands head and shoulders above a lowercase letter, as well as at the head (beginning) of a sentence.

ANTHROP comes from the Greek word for "human being." So an anthropomorphic god, such as Zeus or Athena, basically looks and acts like a human. And in Aesop's fables and many animated cartoons, animals are usually anthropomorphized and behave exactly like furry, four-legged human being.

KINE comes from the Greek word kinesis, meaning "movement." Kinetic energy of motion (as opposed to potential energy, the kind of energy held by a stretched elastic band). Kinetic art is art that has moving parts, such as Alexander Calder's famous mobiles. And cinema, the art of moving pictures, actually comes from the same kine- root as well.

DYNAM comes from the Greek dynamis, meaning "power." A dyne is a unit used in measuring force; an instrument that measures force is called a dynamometer. And when Alfred Nobel invented a powerful explosive in 1867, he named it dynamite.

GRAD comes from the Latin noun gradus, "step" or "degree," and the verb gradi, "to step, walk." A grade is a step up or down on a scale of some kind, and a gradual change takes place in small steps.

REG from the Latin regula, meaning "rule," has given us many English words. Something regular follows a rule of some kind, even if it's just a law of nature. A regime can be a form of rule or government. To regulate an industry means to make and enforce rules, or regulations, for it; removing such rules is called deregulation.

CRIT comes from a Greek verb that means "to judge" or "to decide." So a film critic judges a movie and tells us what's good or bad about it. Her critical opinion may convince us not to go, or we may overlook any negative criticism and see it anyway.

JUR comes from the Latin verb jurare, "to swear, take an oath," and the noun jus, "right or law." A jury, made up of jurors, makes judgments based on the law. And a personal injury was originally something done to you that a court would find unjust.

Number Words

PENT comes from the Greek word for "five." The Pentagon in Washington, D.C., the world's largest office building, has five sides just like any other pentagon. And a pentatonic scale in music has only five notes, rather than the seven notes of the major or minor scale.

QUINT comes from the Latin word meaning "five." Quintuplets are babies that come in sets of five; about 60 U.S. families increase in size by that number every year.