noun turn·stone \-ˌstōn\

Definition of turnstone

  1. :  either of two shorebirds (genus Arenaria) of the sandpiper family:a :  a bird (A. interpres) of worldwide distribution that has black and chestnut upperparts and a black breastb :  a North American bird (A. melanocephala) with black upperparts and breast

Origin and Etymology of turnstone

from a habit of turning over stones to find food

First Known Use: circa 1674

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