three-quarter binding

NOUN
21 LETTERS · 3 SYLLABLES · STARTS WITH T

three-quarter binding is a valid 21-letter word worth 35 points in Scrabble and 39 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
T1H4R1E1E1-0Q10U1A1R1T1E1R1B3I1N1D2I1N1G2
1 + 4 + 1 + 1 + 1 + 0 + 10 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 2 + 1 + 1 + 2 =35 PTS
DOUBLE WORD → 70TRIPLE WORD → 105
MEANING

What does three-quarter binding mean?

NOUN · 1 SENSE
1

The spine and much of the sides are a different material from the rest of the cover.