submarine

n. ship that travels under water, ship that operates entirely under water; (Canada & USA) sandwich made with a baguette filled with cheese and meats and vegetables (tomatoes, onions and lettuce and other condiments)

adj. under water, operating beneath the surface of the water; of or pertaining to submarines

v. attack by submarine; drown by submarine; take part in the operation of a submarine; control a submarine; glide under something

A submarine is a watercraft that can operate underwater. Military submarines were first widely used in World War I and are used by all major navies today. Civilian submarines and submersibles are used for scientific work at depths too great for human divers. The word submarine was originally an adjective meaning "under the sea". Some firms who make diving gear but not parts for submarines, called their work "submarine engineering". "Submarine" as a noun meaning a submersible craft originated as short for "submarine boat" and older books such as Twenty Thousand Leagues Under the Sea always use this term. Also, some people simply say 'sub' instead of saying the entire word 'submarine'.
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Noun
1. a submersible warship usually armed with torpedoes
(synonym) pigboat, sub, U-boat
(hypernym) submersible, submersible warship
(hyponym) attack submarine
(part-meronym) conning tower
2. a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States
(synonym) bomber, grinder, hero, hero sandwich, hoagie, hoagy, Cuban sandwich, Italian sandwich, poor boy, sub, submarine sandwich, torpedo, wedge, zep
(hypernym) sandwich
Verb
1. move forward or under in a sliding motion; "The child was injured when he submarined under the safety belt of the car"
(hypernym) skid, slip, slue, slew, slide
2. throw with an underhand motion
(hypernym) flip, toss, sky, pitch
(classification) baseball, baseball game, ball
3. bring down with a blow to the legs
(hypernym) down, knock down, cut down, push down, pull down
(classification) sport, athletics
4. control a submarine
(hypernym) operate, control
(derivation) submariner
5. attack by submarine; "The Germans submarined the Allies"
(hypernym) attack, assail
Adjective
1. beneath the surface of the sea
(synonym) undersea
(similar) subsurface

adj. marine, of the sea, of the ocean

(n.)
A submarine plant or animal.
  

(a.)
Being, acting, or growing, under water in the sea; as, submarine navigators; submarine plants.