The minor seventh flatted fifth

Aymiee commented about the Bm7-5 chord:

"Unfortunately, I got to Bm7-5 …and my jaw dropped. How do you pronounce it?? How do you play it??"

Here's my attempt to respond based on my limited understanding of music theory:

First some basic chord symbols:

# Represents a sharp or one half step up
b Represents a flat or one half step down
+ Means an augmented note (sharp) and if by itself often means +5.
- Means a dimished note (flat)
5 Refers to a chord with just the root and the fifth (C5 is C and G)

So to pick apart the Bm7-5 you would start with the chord:

B minor chord (Bm): B - D - F#

Then add the "dominant 7th" which is the flatted seventh:

B minor seventh chord (Bm7): B - D - F# - A

Then replace the fifth (F#) with the "flatted fifth" (F):

B minor seventh flatted fifth chord (Bm7-5): B - D - F - A

The chord has a very dissonant sound. Check out Thelonious Monk's "Round Midnight". I believe it's built with "m7-5" chords