The Collaborative International Dictionary
long dozen
Dozen \Doz"en\ (d[u^]z"'n), n.; pl. Dozen (before another noun), Dozens (d[u^]z"'nz). [OE. doseine, dosein, OF. doseine, F. douzaine, fr. douze twelve, fr. L. duodecim; duo two + decem ten. See Two, Ten, and cf. Duodecimal.]
A collection of twelve objects; a tale or set of twelve; with or without of before the substantive which follows. ``Some six or seven dozen of Scots.'' ``A dozen of shirts to your back.'' ``A dozen sons.'' ``Half a dozen friends.''
--Shak.-
An indefinite small number.
--Milton.A baker's dozen, thirteen; -- called also a long dozen.
Wiktionary
long dozen
n. thirteen
WordNet
long dozen
n. the cardinal number that is the sum of twelve and one [syn: thirteen, 13, XIII, baker's dozen]