ithyphallic
Concise Oxford English Dictionary © 2008 Oxford University Press:
ithyphallic /ˌɪθɪˈfalɪk/
▶adjective (especially of a statue) having an erect penis.
– origin C17 (as a noun denoting a sexually explicit poem): via late L. from Gk ithuphallikos, from ithus ‘straight’ + phallos ‘phallus’.
'ithyphallic' also found in these Oxford entries:

