An individual who makes statements which are untrue and not based on fact: Jesse was such a frequent liar that no one would believe him even when he was being honest.
A stringed instrument of the harp family having two curved arms connected at the upper end by a crossbar, used to accompany a singer or reciter of poetry, especially in ancient Greece: The frieze around the very old temple depicted many performers each of whom was playing a lyre.
Estella was no liar when she said she was an expert performer on the lyre because she was a fantastic performer!
Norman was wondering if the stringed musical instrument was a liar (lacking in veracity), because it was called a lyre.
A liar is a person who, when he dies, lies still.