Crossword Clue:

MU a Greek letter

Answer	Crossword Clue
TAU	A Greek letter
STICKINTHEMU	Add a Greek letter?
PICKSUPTHETA	Lifts a Greek letter?

PHI	Greek letter on a key
TAKESITONTHECHI	Endures hardship atop a Greek letter?
TAU	Greek letter shaped like a cross
OMEGA	Greek letter shaped like a horseshoe
PHI	Letter voiced by a Greek giant?
RHO	Greek letter that looks like a "P"
PSI	Greek letter that looks like a pitchfork
PSI	Greek letter that looks like a trident

ETA	Greek letter that's a symbol for viscosity
DELTA	Airline whose name is a Greek letter
RHO	Greek letter that looks like a P
WORNDOWNTOTHENU	Eroded as far as a Greek letter?
GNU	Animal whose name sounds like a Greek letter
PSI	Greek letter that begins with a silent letter
PSI	Greek letter that sounds like a deep breath
THETA	Greek letter with a line through its middle

RHO	Greek letter whose capital looks like a P
RHO	Greek letter that's a homophone of two English words
BEETS	Vegetables whose genus shares its name with a Greek letter
PSI	Greek letter spelled out at the start of a Beatles title?