出典:Wiktionary
出典:『Wiktionary』 (2026/03/04 13:31 UTC 版)
From 中期英語 pibel (also in pibleston), from 古期英語 papolstān (“pebble-stone”), from 古期英語 *papol, *pyppel, *pæbbel of unknown origin + 古期英語 stān. Compare Albanian popël. (Can this etymology be sourced?)
pebble (countable and uncountable, plural pebbles)
pebble (third-person singular simple present pebbles, present participle pebbling, simple past and past participle pebbled)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/16 15:23 UTC 版)
A pebble is a clast of rock with a particle size of 4 to 64 millimetres based on the Krumbein phi scale of sedimentology. Pebbles are generally considered to be larger than granules (2 to 4 millimetres diameter) and smaller than cobbles (64 to 256 millimetres diameter). A rock made predominantly of pebbles is termed a conglomerate. Pebble tools are among the earliest known man-made artifacts, dating from the Palaeolithic period of human history.
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