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1610s, "an image of the penis," from Latin phallus, from Greek phallos "penis," also "carving or image of an erect penis (symbolizing the generative power in nature) used in the cult of Dionysus," from PIE *bhel-no-, from root *bhel- (2) "to blow, inflate, swell" (cf. Old Norse boli "bull," Old English bulluc "little bull," and possibly Greek phalle "whale;" see bole). Used of the penis itself (often in symbolic context) from 1924, originally in jargon of psychoanalysis.
phallus phal·lus (fāl'əs)
n. pl. phal·lus·es or phal·li (fāl'ī')
The sexually undifferentiated tissue in an embryo that becomes the penis or clitoris.
The immature penis considered in psychoanalysis as the libidinal object of infantile sexuality in the male.