ejaculation

n. the automatic expulsion of semen and seminal fluid through the penis resulting from involuntary and voluntary contractions of various muscle groups, normally associated with orgasm. See also premature ejaculation; retrograde ejaculation. —ejaculatory adj.

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Psychology term of the day

January 19th 2025

short-wavelength pigment

the photopigment present in one of the three populations of retinal cones that has maximum sensitivity to a wavelength of 419 nm. The absence of the gene for the short-wavelength pigment causes tritanopia, a form of color blindness in which blue and green are confused with one another. See also long-wavelength pigment; medium-wavelength pigment.