| 释义 |
pumice
pum·ice P0433100 (pŭm′ĭs)n. A light, porous, glassy lava, used in solid form as an abrasive and in powdered form as a polish and an abrasive.tr.v. pum·iced, pum·ic·ing, pum·ic·es To clean, polish, or smooth with pumice.
[Middle English, from Anglo-Norman pomis, from Late Latin pōmex, from Latin pūmex, alteration of spūma, foam.]
pu·mi′ceous (pyo͞o-mĭsh′əs, pə-) adj.pum′ic·er n.pumice (ˈpʌmɪs) n (Geological Science) Also called: pumice stone a light porous acid volcanic rock having the composition of rhyolite, used for scouring and, in powdered form, as an abrasive and for polishingvb (Tools) (tr) to rub or polish with pumice[C15 pomys, from Old French pomis, from Latin pūmex] pumiceous adjpum•ice (ˈpʌm ɪs)
n., v. -iced, -ic•ing. n. 1. a porous or spongy form of volcanic glass, used as an abrasive. v.t. 2. to rub, smooth, clean, etc., with pumice. [1400–50; late Middle English pomis(e) < Anglo-French pomis (compare Old French ponce; see pounce3) < Latin pūmex, s. pūmic-] pu•mi•ceous (pyuˈmɪʃ əs) adj. pum·ice (pŭm′ĭs) A usually light-colored, porous, lightweight rock of volcanic origin. The pores form when water vapor and gases escape from the lava during its quick solidification into rock.pumice
Past participle: pumiced
Gerund: pumicing
| Present |
|---|
| I pumice | | you pumice | | he/she/it pumices | | we pumice | | you pumice | | they pumice |
| Preterite |
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| I pumiced | | you pumiced | | he/she/it pumiced | | we pumiced | | you pumiced | | they pumiced |
| Present Continuous |
|---|
| I am pumicing | | you are pumicing | | he/she/it is pumicing | | we are pumicing | | you are pumicing | | they are pumicing |
| Present Perfect |
|---|
| I have pumiced | | you have pumiced | | he/she/it has pumiced | | we have pumiced | | you have pumiced | | they have pumiced |
| Past Continuous |
|---|
| I was pumicing | | you were pumicing | | he/she/it was pumicing | | we were pumicing | | you were pumicing | | they were pumicing |
| Past Perfect |
|---|
| I had pumiced | | you had pumiced | | he/she/it had pumiced | | we had pumiced | | you had pumiced | | they had pumiced |
| Future |
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| I will pumice | | you will pumice | | he/she/it will pumice | | we will pumice | | you will pumice | | they will pumice |
| Future Perfect |
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| I will have pumiced | | you will have pumiced | | he/she/it will have pumiced | | we will have pumiced | | you will have pumiced | | they will have pumiced |
| Future Continuous |
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| I will be pumicing | | you will be pumicing | | he/she/it will be pumicing | | we will be pumicing | | you will be pumicing | | they will be pumicing |
| Present Perfect Continuous |
|---|
| I have been pumicing | | you have been pumicing | | he/she/it has been pumicing | | we have been pumicing | | you have been pumicing | | they have been pumicing |
| Future Perfect Continuous |
|---|
| I will have been pumicing | | you will have been pumicing | | he/she/it will have been pumicing | | we will have been pumicing | | you will have been pumicing | | they will have been pumicing |
| Past Perfect Continuous |
|---|
| I had been pumicing | | you had been pumicing | | he/she/it had been pumicing | | we had been pumicing | | you had been pumicing | | they had been pumicing |
| Conditional |
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| I would pumice | | you would pumice | | he/she/it would pumice | | we would pumice | | you would pumice | | they would pumice |
| Past Conditional |
|---|
| I would have pumiced | | you would have pumiced | | he/she/it would have pumiced | | we would have pumiced | | you would have pumiced | | they would have pumiced |
Thesaurus| Noun | 1. |  pumice - a light glass formed on the surface of some lavas; used as an abrasivepumice stonerock, stone - material consisting of the aggregate of minerals like those making up the Earth's crust; "that mountain is solid rock"; "stone is abundant in New England and there are many quarries" | | Verb | 1. | pumice - rub with pumice, in order to clean or to smoothenrub - move over something with pressure; "rub my hands"; "rub oil into her skin" |
Translationspumice (ˈpamis) noun a light kind of solidified lava. 輕石(塊)，浮石 轻石（块），浮石 pumice stone noun (a piece of) this type of stone used for cleaning and smoothing the skin etc. 浮石(其粉末用於去汙和磨光皮膚) 浮石（其粉末用于去污和磨光皮肤）
pumice
pumice (pŭm`ĭs), volcanic glass formed by the solidification of lava that is permeated with gas bubbles. Usually found at the surface of a lava flow, it is colorless or light gray and has the general appearance of a rock froth. The viscosity of the lava, the quantity of water vapor and gas, and the rate of cooling together determine the fineness of the vesicular substance. Large amounts of gas result in a finer-grained variety known as pumicite. The chemical composition is that of granite. Coarser-grained rock, with fewer and larger air spaces, is called scoria; it is usually associated with dark-colored igneous rocks of diorite or gabbro composition. Pumice is used chiefly as an abrasive and is included in many scouring preparations. Ground pumice is also used in finishing furniture. Deposits are found in volcanic areas throughout the world. Because of its air chambers, pumice has a very low density and has been observed blowing off volcanic islands in strong winds. It usually floats and can be carried great distances by ocean currents.Pumice a porous, spongelike, vitreous volcanic rock. It is formed during volcanic eruptions as a result of the swelling and rapid cooling of acidic lavas (60–73 percent SiO2) heavily saturated with vapors and gases. The porosity of pumice reaches 80 percent. The volumetric mass is 400–900 kg/m3. Pumice has a hardness of about 6 and is white, gray, or yellow. It melts at 1300°-1400°C. It is a poor conductor of heat. Pumice is used as an abrasive. In the chemical industry it is used in filters, drying devices, and elsewhere. Crushed pumice is used as a lightweight aggregate in concrete, and pumice sand and ash are used as hydraulic admixtures in cement. Pumice deposits are found in many volcanic areas and frequently occur together with various volcanic ashes and tuffs. High-grade pumice deposits are found abroad on the Lipari Islands of Italy. The chief deposits in the USSR are in the Armenian SSR (the Ani group) and the Northern Caucasus, in the vicinity of Nal’chik. REFERENCEKurs mestorozhdenii nemetallicheskikh poleznykh iskopaemykh. Moscow, 1969.pumice[′pəm·əs] (geology) A rock froth, formed by the extreme puffing up of liquid lava by expanding gases liberated from solution in the lava prior to and during solidification. Also known as foam; pumice stone; pumicite; volcanic foam. pumiceLava having a highly porous, loose, spongy, or cellular structure; of relatively high silica content; used in powdered form as an abrasive in polishing, etc.pumice a light porous acid volcanic rock having the composition of rhyolite, used for scouring and, in powdered form, as an abrasive and for polishing pumice
pumice [pum´is] a substance consisting of silicates of aluminum, potassium, and sodium; used in dentistry as an abrasive.pum·ice (pŭm'is), Volcanic cinders ground to particles of varying sizes; used in dentistry for polishing restorations or teeth; an abrasive. [L. pumex (pumic-), a pumice stone] pum·ice (pŭm'is) Volcanic cinders ground to particles of varying sizes; used in dentistry for polishing restorations or teeth; an abrasive. [L. pumex (pumic-), a pumice stone]pumice
Synonyms for pumicenoun a light glass formed on the surface of some lavasSynonymsRelated Wordsverb rub with pumice, in order to clean or to smoothenRelated Words |