n. 解谜（enigma的复数）

enigma \e*nig"ma\ ([-e]*n[i^]g"m[.a]), n.; pl. {enigmas}
([-e]*n[i^]g"m[.a]z). [L. aenigma, Gr. a'i`nigma, fr.
a'ini`ssesqai to speak darkly, fr. a'i^nos tale, fable.]
1. A dark, obscure, or inexplicable saying; a riddle; a
statement, the hidden meaning of which is to be discovered
or guessed.

A custom was among the ancients of proposing an
enigma at festivals. --Pope.

2. An action, mode of action, or thing, which cannot be
satisfactorily explained; a puzzle; as, his conduct is an
enigma.