1. plural of spirula; small deep-sea cephalopod mollusks with internal spiral shells
Usage: zoological

Examples

• The marine biologist collected several spirulas from the deep ocean floor.
• Spirulas are rarely seen alive because they live in deep waters.
• The internal shells of spirulas are often found washed up on beaches.
• Scientists study spirulas to understand deep-sea cephalopod evolution.
• The spirulas’ unique spiral shells distinguish them from other mollusks.