nerd
Concise Oxford English Dictionary © 2008 Oxford University Press:
nerd/nɜːd/
▶noun informal a person who lacks social skills or is boringly studious.
– derivatives
nerdish adjective,
nerdishness noun,
nerdy adjective (nerdier, nerdiest).
nerdish adjective,
nerdishness noun,
nerdy adjective (nerdier, nerdiest).
– origin 1950s (orig. US): of unknown origin.
'nerd' also found in these Oxford entries:

