Answer:

oed

Answer	Crossword Clue
OED	Brit. multivolume set
OED	Brit. reference work
OED	Multivolume ref.

OED	Big dict.
OED	Gigantic ref. work
OED	Lexicographic colossus
OED	Ref. that's gone through two editions in 125 years
OED	Ref. that recently added the word "hoverboard"
OED	Lexicon's initials
OED	Brit. dictionary
OED	Londoner's lexicon (abbr.)

OED	U.K. lexicon
OED	Lexicon for a don
OED	Big Brit. bk.
OED	Big ref. full of defs.
OED	Wordsmith's ref.
OED	UK lexical tome
OED	U.K. reference
OED	Voluminous Brit. ref. source

OED	Multivolume ref. set
OED	"The Professor and the Madman" subj.
OED	20-vol. reference
OED	Big ref.
OED	Authoritative ref.
OED	Subj. of Simon Winchester's "The Meaning of Everything"
OED	Its Vol. XVI is "Soot-Styx"
OED	Multi-volume ref.

OED	Ref. set
OED	Voluminous lexicological work: Abbr.
OED	Wk. that begins with "A-Bazouki"
OED	20-vol. lexicon
OED	Brit. reference
OED	Ref. work chronicled in "The Professor and the Madman"
OED	130-lb.-plus ref.
OED	Hefty ref.

OED	20-volume ref.
OED	British ref.
OED	Etymologist's ref.
OED	Brit. lexicon
OED	British ref. work