/bɑːrk/·noun / verb·Tree bark sense: attested c. 1320 in Northern Middle English texts, reflecting Norse settlement zones; earliest clear citation in the Cursor Mundi (c. 1300), a Northern English verse chronicle with heavy Norse-influenced vocabulary. Dog bark sense (OE beorcan): attested in Old English glosses c. 1000 CE, e.g. in Ælfric's writings.·Established
Origin
English 'bark' conceals two distinct Germanic etymologies: the tree-bark noun from Old Norse börkr, brought into English through Danelaw settlement, and the sound-verb from Old English beorcan, a native Saxon word — both surviving unchanged through the Norman Conquest.
Definition
The tough outer covering of the woody stems and roots of trees and shrubs, derived from Proto-Germanic *barkuz and cognate with Old Norse börkr.
The Full Story
Proto-Germanic (dual source)Pre-700 CE (OE beorcan) / 9th–11th century CE (Norse börkr)well-attested
Modern English 'bark' represents a rare case of Germanic homophony — two entirely distinct Proto-Germanic roots that converged into a single spelling in Middle English. The first etymology concerns the outercovering of trees. OldNorse 'börkr' (tree bark) descends from Proto-Germanic *barkuz, which is cognate
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The Norse birch-bark tradition was so practical that medieval Norwegians wrote everyday letters and trade messages on strips of birch bark — dozens have been recovered from Bergen. When Norse settlersestablished the Danelaw in northern England, they brought this bark vocabulary with them, and their word börkr gradually displaced the native Old English 'rind' across the north and east. The dog-bark verb from OldEnglish beorcan, meanwhile, was entirely unrelated and simply happened to converge on the same form — two
'borke' and likely related to the PIE root *bʰerH- (to cut, scrape), reflecting the physical act of stripping or scraping the outer layer from wood. This Norse form entered Old English during the Danelaw period (9th–11th
and eventually displaced the older word entirely. The Danelaw Norse stratum is responsible for a significant portion of everyday English vocabulary, including 'sky', 'egg', 'window', and 'skin', all of which displaced or supplemented their Old English equivalents. The second etymology is native Old English: 'beorcan' (to bark, to bay), from Proto-Germanic *berkanan, cognate with Old Norse 'berkja' (to bark) and ultimately related to PIE *bʰerH- in its sense of sharp, abrupt sound — paralleling the scraping or cutting semantic field. Old English 'beorcan' gave Middle English 'berken', which through regular sound change became 'barken' and then 'bark'. The two forms — Norse 'bark' (noun, tree covering) and OE-derived 'bark' (verb, dog's cry) — merged in spelling by the late Middle English period, creating a polysemous word with no synchronic connection between its two meanings. This convergence is a textbook example of accidental homophony arising from parallel sound changes across cognate but genealogically distinct development paths within the Germanic family. Key roots: *bʰerH- (Proto-Indo-European: "to cut, scrape, strip; also applied to sharp abrupt sounds — ancestral to both Germanic roots"), *barkuz (Proto-Germanic: "tree bark, the stripped outer layer of wood — source of Norse börkr (tree bark etymology)"), *berkanan (Proto-Germanic: "to bark, to bay — source of Old English beorcan (dog bark etymology)").