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Children's Dictionary
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photosynthesis the process by which a green plant uses sunlight to change water and carbon dioxide into food for itself.
phrase a part of a sentence that has meaning and grammatical order but does not have both a subject and a verb. "Wants to see" and "the horror movie" are both phrases in the sentence "Bert wants to see the horror movie again." [4 definitions]
physical of the body. [3 definitions]
physical education instruction in sports, exercise, and the care of the human body. Physical education is taught in a school.
physically in, with, or by means of the body.
physician a doctor of medicine who is qualified and licensed to treat illness and injury.
physicist a scientist who works in physics.
physics (used with a singular verb) the science that deals with matter and energy, their qualities, and the relationships between them. Physics includes the study of light, heat, sound, electricity, and force.
pi a number equal to the ratio of the circumference of a circle to its diameter. The value of pi is approximately 3.1416 or 22/7.
pianist a person who plays the piano.
piano1 a musical instrument with a keyboard and many wire strings. A piano is played by pressing keys that cause small hammers to strike the strings.
piccolo a small flute with a pitch that is an octave higher than that of the standard flute.
pick1 to choose from a group. [9 definitions]
pick2 a sharp, pointed tool used for digging or breaking up rocks or other hard substances.
pickax a pick that has one pointed end and a blade that is shaped liked a chisel on the other end.
pickerel a fish that is related to pike. Pickerel are used for food or sport.
picket a pointed post fixed into the ground, used to make a fence or hold something in place. [3 definitions]
pickle a cucumber or another vegetable or fruit that has been preserved in salt water, vinegar, and seasonings. [2 definitions]
pick on (informal) to treat someone in a mean way, either with words or in a physical way.
pick out to choose.
pickpocket a person who steals from pockets or purses in crowded or public places.