石|いしishi[2]odaka (tail-high)

1. nounstone; rock; pebble
   その子供こどもは小ちいさな石いしを拾い上ひろいあげた。↗

   The child picked up a small stone.
2. nounjewel; precious stone
3. nounflint (in a lighter)
4. noun(round) game piece; stone (in go, etc.); disc (in Othello)
5. noun, medicinestone (in the bladder, kidney etc.); calculus

• Synonym岩いわNeutralA large rock or boulder, bigger than 「石」; seen in compounds like 「岩場」 and 「岩山」.
• Synonym石ころいしころCasualA small stone by the roadside, with a nuance of something unremarkable: 「石ころを蹴る」. More colloquial than 「石」.
• Synonym岩石がんせきWrittenA written, academic term for rock, used in geology as in 「岩石の分類」. In everyday speech, 「石」 or 「岩」 is normal.
• Synonym石くれいしくれCasualA small piece or fragment of stone. It has an old-fashioned ring and is not much used; in everyday speech 「石ころ」 is the usual word.
• Synonym石塊せっかいNeutralThe same word as above, also written 「石塊」. Also used figuratively for something worthless, as in 「石ころ同然」.
• SynonymストーンNeutralA loanword for stone; also covers gemstones and jewelry, or the British 14-pound weight unit, as in 「パワーストーン」. For roadside stones, 「石」 is the usual word.

For stones in general, 「石」 is the default. Use 「岩」 for large rocks, 「石ころ」 for small pebbles, 「岩石」 in geology, and 「ストーン」 for gems and accessories. 「石くれ」 is rare and old-fashioned.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. (いし) 岩石がんせきや鉱物こうぶつの塊かたまり。岩いわより小ちいさく、砂すなより大おおきい。
2. (いし) 語義ごぎ1に限かぎらず岩石がんせきや鉱物こうぶつ一般いっぱん。
3. 一般的いっぱんてきなもの。1石こく＝10斗と＝100升しょう≒180リットル
4. 船ふね・材木ざいもくの容量ようりょう。1石こく＝10立方りっぽう尺しゃく≒278リットル