We don't have synonyms for second lady yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are second day, second last and second law.
(n) :
The female spouse of the second-in-command or first in the line-of-succession of a political jurisdiction (for example, of a vice president).
(n) :
Alternative letter-case form of Second Lady. [The female spouse of the second-in-command or first in the line-of-succession of a political jurisdiction (for example, of a vice president).]
(n) :
The female spouse of the second-in-command or first in the line-of-succession of a political jurisdiction (for example, of a vice president).
(n) :
Alternative letter-case form of Second Lady. [The female spouse of the second-in-command or first in the line-of-succession of a political jurisdiction (for example, of a vice president).]