Wordnet 3.0
NOUN (1)
1.
a roundheaded bolt for timber;
threaded along part of the shank;
inserted into holes already drilled;
The Collaborative International Dictionary of English v.0.48:
carriage bolt \carriage bolt\ n.
a type of bolt threaded only at the end opposite the head,
used mostly for fastening pieces of timber together, and
inserted into pre-drilled holes.
[PJC]
WordNet (r) 3.0 (2006):
carriage bolt
n 1: a roundheaded bolt for timber; threaded along part of the
shank; inserted into holes already drilled