a stone
She picked up a stone from the riverbank.
She picked up a single piece of rock from the riverbank.
a single piece of rock, typically small enough to hold in one's hand
The archaeologist found a stone with ancient carvings.
The archaeologist found a single piece of rock with ancient carvings.
Children often collect stones on the beach.
Children often collect small pieces of rock on the beach.
Used to emphasize singularity and small size, as opposed to 'stones' (plural) which may refer to multiple pieces.
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Pro Tip
Distinguishing 'stone' and 'rock'
'Stone' and 'rock' are often interchangeable in everyday speech, but 'stone' is slightly more general and can refer to smaller pieces, while 'rock' may imply a larger mass. 'Pebble' is a subset of 'stone' and refers to very small, smooth stones.
Gold Rule
Singular vs. Plural
Use 'a stone' to emphasize a single piece, and 'stones' for multiple pieces. Example: 'She held a stone in her hand' vs. 'She gathered stones in her pocket.'
Word Origin
From Old English 'stān', meaning 'stone, rock, pebble'. The phrase 'a stone' as a singular unit has been used since Middle English to refer to a single piece of rock.
Usage Notes
In everyday speech, 'a stone' is often interchangeable with 'a rock' or 'a pebble', though 'stone' can imply a slightly more natural or unprocessed state. The phrase is literal and does not carry idiomatic meaning.