add (v.)youdaoicibaDictYouDict[add 词源字典]
late 14c., "to join or unite (something to something else)," from Latin addere "add to, join, attach, place upon," from ad- "to" (see ad-) + -dere comb. form meaning "to put, place," from dare "to give" (see date (n.1)). Meaning "to do sums, do addition" also is from late 14c. Related: Added; adding. To add up "make sense" is from 1942.[add etymology, add origin, 英语词源]
andiron (n.)youdaoicibaDictYouDict
c. 1300, from Old French andier, which is of unknown origin, perhaps from Gaulish *andero- "a young bull" (cognates: Welsh anner "heifer"), which would make sense if they once had bull's heads cast onto them. Altered by influence of Middle English iren (see iron (n.)).