  We extract a relatively precise value for the decay constant of the D+ meson
by measuring B(D+ -> mu+ nu)=(4.40 +/- 0.66 {+0.09}{-0.12}) x 10^{-4}, using
281 inverse-pb of data taken on the psi(3770) resonance with the CLEO-c
detector. We find fD+=(222.6 +/- 16.7 {+2.8}{-3.4}) MeV, and compare with
current theoretical calculations. We also set a 90% confidence upper limit on
B(D+ -> e+ nu)<2.4 x 10^{-5} which limits contributions from non-standard model
physics.
