coelacanth (n.)youdaoicibaDictYouDict[coelacanth 词源字典]
1857, from Modern Latin Coelacanthus (genus name, 1839, Agassiz), from Greek koilos "hollow" (from PIE root *kel- (2); see cell) + akantha "spine" (see acrid). So called from the hollow fin rays supporting the tail. Known only as a fossil, the most recent one from 70 million years ago, until discovered living in the sea off the east coast of South Africa Dec. 22, 1938. The specimen was described by Marjorie Courtney-Latimer, who wrote about it to S.African ichthyologist J.L.B. Smith.
I stared and stared, at first in puzzlement. I did not know any fish of our own, or indeed of any seas like that; it looked more like a lizard. And then a bomb seemed to burst in my brain, and beyond that sketch and the paper of the letter, I was looking at a series of fishy creatures that flashed up as on a screen, fishes no longer here, fishes that had lived in dim past ages gone, and of which only fragmentary remains in rock are known. [J.L.B. Smith, "Old Fourlegs: The Story of the Coelacanth," 1956]
[coelacanth etymology, coelacanth origin, 英语词源]
steward (n.)youdaoicibaDictYouDict
Old English stiward, stigweard "house guardian, housekeeper," from stig "hall, pen for cattle, part of a house" (see sty (n.1)) + weard "guard" (see ward (n.)). Used after the Conquest as the equivalent of Old French seneschal (q.v.). Meaning "overseer of workmen" is attested from c. 1300. The sense of "officer on a ship in charge of provisions and meals" is first recorded mid-15c.; extended to trains 1906. This was the title of a class of high officers of the state in early England and Scotland, hence meaning "one who manages affairs of an estate on behalf of his employer" (late 14c.). Meaning "person who supervises arrangements" at a meeting, dinner, etc., is from 1703.

The Scottish form (with terminal -t attested from late 14c.) is reflected in Stewart, name of the royal house descended from Walter (the) Steward, who married (1315) Marjorie de Bruce, daughter of King Robert. Stuart is a French spelling, attested from 1429 and adopted by Mary, Queen of Scots.