David Shulman, who sought the obscure origins of thousands of words and contributed them to the Oxford English Dictionary, died Oct. 30 in Brooklyn. He was 91.
Mr. Shulman was credited with finding the beginnings of the usage of terms like "The Great White Way," "Big Apple," "doozy," "hoochie-coochie" and "hot dog."
During World War II, he served in the Army, cracking secret Japanese codes.
He helped found the American Cryptogram Association and published "An Annotated Bibliography of Cryptography," which is still used by experts.
During his lifetime, he contributed volumes to the New York Public Library, which he considered a second home. He also gave 20,000 century-old post cards and other possessions to the library.