roost


Concise Oxford English Dictionary © 2008 Oxford University Press:
roost1
noun a place where birds regularly settle to rest at night, or where bats congregate to rest in the day. verb (of a bird or bat) settle or congregate for rest.
– origin OE hrōst; of unknown ultimate origin.



Concise Oxford English Dictionary © 2008 Oxford University Press:
roost2
noun (in the Orkneys and Shetlands) a tidal race.
– origin C17: from ON rǫst.
'roost' also found in these Oxford entries:

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