To cool (an engine) with water, especially circulating water.(verb-transitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "water-cool" in a sentence
"Indeed, just because you have two 5970 videocards and want to water-cool your CPU, it doesn't mean you have to go with a full-tower anymore; some mid-towers have radiator mount points and room for your beefiest cards."
"Manned Orbiting Laboratory gloves with sharkskin palms and sewn-in steel fingernails, so nimble that an astronaut could pick up a dime while wearing them, even when they were pressurized; long johns laced with plastic pipes, to water-cool the wearer; and box after box of headgear, including Armstrong's gold-visored external helmet, once thought to have been left on the moon."
"For those that plan to water-cool an A77 with a external rad may be surprised to see the inlet hole is covered by a hard plastic grommet rather than a rubber one."