parlor grand piano

NOUN
18 LETTERS · STARTS WITH P

parlor grand piano is a valid 18-letter word worth 22 points in Scrabble and 28 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
P3A1R1L1O1R1G2R1A1N1D2P3I1A1N1O1
3 + 1 + 1 + 1 + 1 + 1 + 0 + 2 + 1 + 1 + 1 + 2 + 0 + 3 + 1 + 1 + 1 + 1 =22 PTS
DOUBLE WORD → 44TRIPLE WORD → 66
MEANING

What does parlor grand piano mean?