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The Collaborative International Dictionary
Sea squirt

Sea squirt \Sea" squirt`\ (Zo["o]l.) An ascidian. See Illust. under Tunicata.

Wiktionary
sea squirt

n. Any sessile tunicate, of the class Ascidiacea, which squirts water from two openings when touched; they are filter feeders

WordNet
sea squirt

n. ascidian that can contract its body and eject streams of water

Usage examples of "sea squirt".

For the fifth time since announcing this goal, a Sea Squirt action has gone badly wrong.

A sea squirt was shoring himself up with the flow from an undersea fresh-water spring, getting tipsy on the rare liquid.

Or, more precisely, somewhat less alive than a sea squirt is, after it becomes sessile and eats its brain.