Wordnet 3.0
NOUN (1)
1.
a cloth covering for a service cap with a flap extending over the back of the neck to protect the neck from direct rays of the sun;
The Collaborative International Dictionary of English v.0.48:
Havelock \Hav"e*lock\ (h[a^]v"[-e]*l[o^]k), n. [From Havelock,
an English general distinguished in India in the rebellion of
1857.]
A light cloth covering for the head and neck, used by
soldiers as a protection from sunstroke.
[1913 Webster]
WordNet (r) 3.0 (2006):
havelock
n 1: a cloth covering for a service cap with a flap extending
over the back of the neck to protect the neck from direct
rays of the sun