Answer:

tome

Answer	Crossword Clue
TOME	Heavy reading?
TOME	MW NI2, for one
TOME	"Sock it ...!"

TOME	Unabridged dictionary, for one
TOME	Big book
TOME	Heavy reading
TOME	Large book
TOME	Weighty volume
TOME	Book you're unlikely to bring on the subway
TOME	"A Dance With Dragons," e.g. -- 1,040 pages, seriously?
TOME	Huge work

TOME	Fat volume
TOME	Scholarly volume
TOME	Big fat book
TOME	Heavy read
TOME	"She meant a lot ..."
TOME	Hefty volume
TOME	Unabridged dictionary, e.g.
TOME	Large volume

TOME	Scholar's reading
TOME	"Come ..": Mathis hit
TOME	"War and Peace," e.g.
TOME	Big volume
TOME	Scholar's volume
TOME	Big, heavy book
TOME	It may begin with "Book I"
TOME	Learned book

TOME	"That's news .."
TOME	Heavy volume
TOME	Scholarly book
TOME	"In my opinion ..."
TOME	Voluminous volume
TOME	Reference work, usually
TOME	Many a saga
TOME	Strong-spined volume

TOME	Weighty work
TOME	Heavy book
TOME	Bulky book
TOME	It has a wide spine
TOME	It's no quick read