Primary Seismic Waves

Science / Geology / Primary Seismic Waves: The fastest set of earthquake vibrations - also known as P-waves. They move through the Earth in compression and expansion motions (much like sound waves move through air). Called primary because they are the first recorded at a seismograph. Primary waves are able to travel through both solids and liquids.

Other Words for Primary

Primary Adverb Synonyms: first, prime, principal, chief, main, leading, pre-eminent, cardinal, fundamental, basic, essential, predominant, elementary, elemental, underlying
Primary Adjective Synonyms: firsthand, direct, immediate
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Primary Production

Science / Marine Biology / Primary Production: The production of living matter by photosynthesizing organisms or by chemosynthesizing organisms. Usually expressed as grams of carbon per square meter per year MORE

Primary Process

Science / Psychiatry / Primary Process: In psychoanalytic theory, the generally unorganized mental activity characteristic of the unconscious. This activity is marked by the free discharge of energy and excitation without regard to the dema MORE

Primary Radar

Technology / Radar / Primary Radar: Primary radar systems receive reflections of their own transmitted signals as returned signals from the target. MORE

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