We found 2 definitions of wd from 2 different sources.
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What does wd mean?
OmegaWiki DictionaryOmegaWiki DictionaryΩ
wd A small and very dense star composed mostly of electron-degenerate matter.
Sailor's Word-BookThe Sailor's Word-Book⛵
wd The watch-word; the parole and countersign, which, being issued to the authorized persons at guard-mounting, become a test whereby spies or strangers are detected.
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