searo does not survive later stages of English, and Wiktionary lists cognates with only other dead languages. Though I believe Tolkien did borrow it for the character Saruman
In 1942, at the height of British industrial war mobilization, an unlikely cohort scavenged the nation’s coastline for a precious substance. Among them were researchers, lighthouse keepers, members of the Royal Air Force and the Junior Red Cross, plant collectors from the County Herb Committee, Scouts and Sea Scouts, schoolteachers and students. They were looking for fronds and tufts of seaweed containing agar, a complex polysaccharide that forms the rigid cell walls of certain red algae.，详情可参考heLLoword翻译官方下载
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