Which Grey's Anatomy character is nicknamed Lexipedia?

Which Grey's Anatomy character is nicknamed Lexipedia? The answer is Lexie Grey.

Lexie Grey earns the nickname “Lexipedia” because she has an eidetic memory and can retain large amounts of information with remarkable accuracy. Her ability is especially valuable in the demanding environment of surgical training, where residents must rapidly learn anatomy, diagnoses, procedures, and patient histories.

The nickname also captures how the series presents Lexie: highly intelligent, eager to prove herself, and sometimes socially awkward despite her academic gifts. Alex Karev is associated with giving her the nickname, which plays on “Lexie” and “encyclopedia.” It is not the name of a hospital, medical technique, or separate character.

Lexie's intelligence does not make her invulnerable. She struggles with grief after her mother's death, the pressure of residency, and her complicated relationship with Meredith, who initially has difficulty accepting her half-sister. Lexie later becomes a talented surgical resident before dying in the season 8 plane crash.