Added 10 October 2026 submersible noun Categories: ThingsRare Words noun ! Definition from WordNet 3.1, Princeton University. More about submersible at Wordnik → Where our words come from → An apparatus intended for use under water. A warship designed to operate under water. adjective Capable of being immersed in water or functioning while submerged. a submersible pump Related Words: submergiblesubmergedsubseaunderseasubmarineunderwatersubu-boatalvinsubmergeableplungeableunsubmersible Back to today's word