parlour grand piano

NOUN
19 LETTERS · STARTS WITH P

parlour grand piano is a valid 19-letter word worth 23 points in Scrabble and 30 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
P3A1R1L1O1U1R1G2R1A1N1D2P3I1A1N1O1
3 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 2 + 1 + 1 + 1 + 2 + 0 + 3 + 1 + 1 + 1 + 1 =23 PTS
DOUBLE WORD → 46TRIPLE WORD → 69
MEANING

What does parlour grand piano mean?