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Pollen

/ˈpälən/ Noun, pl. pollens 1. A fine to coarse powder containing the microgametophytes of seed plants, which produce the male gametes (sperm cells). Pollen grains have a hard coat that protects the sperm cells during the process of their movement from the stamens to the pistil of flowering plants or from the male cone to the female cone of coniferous plants. (wikipedia.org) 2. A fine powdery substance, typically yellow, consisting of microscopic grains discharged from the male part of a flower or from a male cone. Each grain contains a male gamete that can fertilize the female ovule, to which pollen is transported by the wind, insects, or other animals. (Google Dictionary) 3. The microspores of seed plants, the powdery mass of microspores shed from anthers (biology-online.org); a mass of microspores in a seed plant appearing usually as a fine dust (merriam-webster.com). 4. The fine spores that contain male gametes and that are borne by an anther in a flowering plant (wordnetweb.princeton.edu). 5. A dusty bloom on the body of an insect (merriam-webster.com). Word origin: From Latin pollen “mill dust; fine flour,” related to polenta “peeled barley,” and pulvis...

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Pollution

/pəˈlo͞oSHən/ Noun 1. The introduction of contaminants into the natural environment that cause adverse change. Pollution can take the form of chemical substances or energy, such as noise, heat or light. Pollutants, the components of pollution, can be either foreign substances/energies or naturally occurring contaminants. Pollution is often classed as point source or nonpoint source pollution. (wikipedia.org) 2. The change in the environment caused by natural or artificial input of harmful contaminants into the environment, and may cause instability, disruption or harmful effects to the ecosystem. (biology-online.org) 3. The act of polluting; the state of being polluted. (biology-online.org) 4. The pollutant or contaminant in the environment. (biology-online.org) 5. The action of polluting especially by environmental contamination with man-made waste; also, the condition of being polluted (merriam-webster.com); undesirable state of the natural environment being contaminated with harmful substances as a consequence of human activities (wordnetweb.princeton.edu). 6. The addition of any substance (solid, liquid, or gas) or any form of energy (such as heat, sound, or radioactivity) to the environment at a rate faster than it can be dispersed, diluted, decomposed, recycled, or stored in some harmless form. (global.britannica.com) Word origin: From Late Latin pollutionem (nominative pollutio) “defilement,” noun of action from past participle stem of Latin polluere “to soil, defile, contaminate,” from por– “before” + –luere...

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Polydipsia

/ˌpälēˈdipsēə/ Noun 1. A non-medical symptom in which the patient displays excessive thirst. (wikipedia.org) 2. Excessive and constant thirst occasioned by disease. (wiktionary.org) 3. Excessive or abnormal thirst (as in cases of diabetes or kidney dysfunction). (merriam-webster.com and wordnetweb.princeton.edu) Word origin: From Greek polydipsios “very thirsty,” from poly- + dipsa “thirst” + -ia “condition...

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Polyphagia

[pol-ee-fey-jee-uh, -juh] Noun 1. Refers to excessive hunger or increased appetite.(wikipedia.org) 2. (Zoology) The eating of many different types of food. Syn: Hyperphagia Word origin: Medical Latin, from Greek polyphagia “excess in eating,” from polyphagos “eating to excess,” from polys “much” + phagein “to...

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Polyuria

/ˌpäliˈyo͝orēə/ Noun 1. A condition usually defined as excessive or abnormally large production or passage of urine (at least 2.5 or 3 L over 24 hours in adults). (wikipedia.org) 2. The production of an abnormally large amount of urine; one symptom of diabetes. (wiktionary.org) 3. Renal disorder characterized by the production of large volumes of pale dilute urine; often associated with diabetes....

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