noun pl. phalli -·li′ (-ī′) or phalluses -·luses

1. a representation or image of the penis as the reproductive organ, worshiped as a symbol of generative power, as in the Dionysiac festivals of ancient Greece
2. Anat.
   1. the penis or clitoris
   2. the undifferentiated embryonic tissue that develops into the penis or clitoris

Etymology: L < Gr phallos < IE base *bhel-, to swell > L follis, leather sack, flare, to blow