Final answer:
The missing word in the line from the Groucho Marx song is "Tattooed".
Step-by-step explanation:
The missing word in the line from the Groucho Marx song "Lydia the BLANK Lady" is "Tattooed". The full line is: "She has eyes that folks adore so / And a torso even more so." In the song, Groucho Marx is describing Lydia, emphasizing her remarkable physical features. The word "tattooed" suggests that Lydia has body art, which was considered unconventional and intriguing at the time the song was written.