lapillus


lapillus
/leuh pil"euhs/, n., pl. lapilli /-pil"uy/.
a small stony particle ejected from a volcano.
[1740-50; < L: little stone, pebble, dim. of lapis stone]

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▪ volcanic ejecta
plural  Lapilli, 
 unconsolidated volcanic fragment with a diameter between 4 and 32 mm (0.16 and 1.26 inches) that was ejected during a volcanic explosion. Lapilli may consist of fresh magma, solid magma from a prior eruption, or basement rocks through which the eruption passed. Accretionary lapilli are pellets formed by the accretion of volcanic ash or dust around moisture droplets; as in hailstones formed of water, these volcanic “hailstones” may show concentric rings—some as much as 10 cm (four inches) across—when they are carried through the eruption cloud several times by turbulent updrafts.

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Universalium. 2010.

Look at other dictionaries:

  • lapillus — [lə pil′əs] n. pl. lapilli [lə pil′ī΄] [L, dim. of lapis, stone] a small fragment of igneous rock, up to the size of a walnut, ejected from a volcano …   English World dictionary

  • lapillus — (plural lapilli)) the otolith in the utriculus of the pars superior. It is held in a vertical position against the cells of the utricular macula which is innervated by the anterior branch of cranial nerve VIII (the stato acoustic nerve).… …   Dictionary of ichthyology

  • Lapillus — La|pịl|lus 〈m.; , pịl|li; meist Pl.〉 bei Vulkanausbrüchen ausgeworfenes, 1 bis 3 cm großes Lavastück [<ital. lapilli (Pl.) „Steinchen“ <lat. lapillus „Steinchen“, Verkleinerungsform zu lapis „Stein“] …   Universal-Lexikon

  • Lapillus — La|pịl|lus 〈m.; Gen.: , Pl.: pịl|li; meist Pl.〉 bei Vulkanausbrüchen ausgeworfenes, 1 bis 3 cm großes Lavastück [Etym.: <ital. lapilli (Pl.) »Steinchen« <lat. lapillus »Steinchen«, Verkleinerungsform zu lapis »Stein«] …   Lexikalische Deutsches Wörterbuch

  • lapillus — noun (plural lapilli) Etymology: Latin, diminutive of lapis Date: 1747 a small stony or glassy fragment of lava ejected in a volcanic eruption …   New Collegiate Dictionary

  • lapillus — n. small stone ejected from a volcano …   English contemporary dictionary

  • lapillus — la·pil·lus …   English syllables

  • lapillus — la•pil•lus [[t]ləˈpɪl əs[/t]] n. pl. pil•li [[t] ˈpɪl aɪ[/t]] gel a small stony particle ejected from a volcano • Etymology: 1740–50; < L: pebble, dim. of lapis stone …   From formal English to slang

  • lapillus —   n. (pl. li ) small stone, especially ejected by volcano.    ♦ lapilliform, a. like small stones …   Dictionary of difficult words

  • lapillus — …   Useful english dictionary


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