Wiktionary
n. The clear, colorless, viscous fluid that is secreted from an aroused penis before ejaculation.
Wikipedia
Pre-ejaculate (also known as pre-ejaculatory fluid, preseminal fluid, or Cowper's fluid, and colloquially as pre-cum) is the clear, colorless, viscous fluid that is emitted from the urethra of the penis during sexual arousal. It is similar in composition to semen but has some significant chemical differences. The presence of sperm in the fluid is variable. Research has found no or low levels of sperm in pre-ejaculate, though these existing studies are non-generalizable due to examining small numbers of men. A contrary, yet non-generalizable study that found mixed evidence, including individual cases of a high sperm concentration, was published in March 2011. Pre-ejaculate is believed to function as a lubricant and an acid neutralizer. The amount of pre-ejaculate emitted varies widely between individuals; some men emit none.
Usage examples of "pre-ejaculate".
A thread of pre-ejaculate stretched downward from the dark one's helmet, glistening in the soft golden light.
Unzipping his slacks, she freed his erection and swirled her tongue around the pre-ejaculate covered tip until she felt him tense beneath her.
He was so turned on he could feel pre-ejaculate converging from the tip of his penis to saturate his boxers.
His tongue traced over the spots he so much adored as he poised the swollen head, already wet with pre-ejaculate, at the opening of her channel.