Jack (n.)
definition: A bar of iron athwart ships at a topgallant masthead
To support a royal mast and give spread to the royal shrouds; -- called also jack crosstree.
Jack is a 4 letter word that begins with a J and ends in a K

Jack (n.)
definition: A coarse and cheap mediaeval coat of defense
Esp. one made of leather.
Jack is a 4 letter word that begins with a J and ends in a K

Jack (n.)
definition: A compact
Portable machine for planing metal.
Jack is a 4 letter word that begins with a J and ends in a K

Jack (n.)
definition: A device to pull off boots.

Jack is a 4 letter word that begins with a J and ends in a K

Jack (n.)
definition: A drinking measure holding half a pint; also
One holding a quarter of a pint.
Jack is a 4 letter word that begins with a J and ends in a K

Jack (n.)
definition: A familiar nickname of
Or substitute for John.
Jack is a 4 letter word that begins with a J and ends in a K

Jack (n.)
definition: A flag
Containing only the union without the fly usually hoisted on a jack staff at the bowsprit cap; -- called also union jack. The American jack is a small blue flag with a star for each State.
Jack is a 4 letter word that begins with a J and ends in a K

Jack (n.)
definition: A grating to separate and guide the threads; a heck box.

Jack is a 4 letter word that begins with a J and ends in a K

Jack (n.)
definition: A hood or other device placed over a chimney or vent pipe
To prevent a back draught.
Jack is a 4 letter word that begins with a J and ends in a K

Jack (n.)
definition: A large
California rock fish (Sebastodes paucispinus); -- called also boccaccio and merou.
Jack is a 4 letter word that begins with a J and ends in a K

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