| Compound Forms/Formes composées |
| across the sea | | par-delà la mer |
| air and sea | bataille | aéronavale adj |
| air and sea | | aéronaval adj |
| air-sea rescue | | sauvetage air-mer nm |
| at sea adj | (disorientated) | perdu adj |
| | Clara was all at sea in the advanced calculus class. |
| | Je n'y comprends rien, je suis complètement perdu. |
| | fam | paumé adj |
| | fam | largué adj |
| | | déboussolé adj |
| at sea adv | literal (on the open water) | en (haute) mer adv |
| | The old sailor loves to recount his adventures at sea. |
| Atlantic sea scallop | Placopecten magellanicus (seafood) fruits de mer | pétoncle nm |
| be lost at sea vi | (go missing in or on the ocean) | être disparu en mer v + adj |
| | The divers found, on the ocean floor, the ship that had been lost at sea for several weeks. |
| | | être perdu en mer |
| black sea bass | | bar noir n |
| bottom of the sea | | fond de la mer |
| burial at sea n | (sailor's funeral) | obsèques en mer nfpl |
| | My grandfather had an honoured burial at sea. |
| by sea | | par voie de mer |
| deep-sea | dont la profondeur paraît insondable | abyssal adj |
| deep-sea | | pélagique adj |
| deep-sea diver n | (sb who dives at great depths with helmet and air hose) | plongeur sous-marin nm |
| | Jacques Cousteau sometimes filmed as a deep-sea diver. |
| deep-sea diving n | (diving at great depths with air hose and helmet) | plongée en eau profonde nf |
| | Deep-sea diving opens a whole new universe to scientists, engineers and archeologists. |
| | La plongée en eau profonde ne s'improvise pas, il faut suivre une préparation et être en bonne forme physique. |
| go to sea | | aller à la mer v |
| heavy sea | | grosse nf |
| heavy sea | | mer grosse |
| high sea | | haute mer |
| high-sea | | haute mer |
| inland sea | | mer intérieure |
| land on the sea | se poser sur l'eau (avion) | amerrir v |
| mean sea level | | niveau moyen de la mer |
| over sea level adv | (higher than the ocean's surface) | au-dessus du niveau de la mer adv |
| put out to sea v | (leave land, embark) | prendre la mer loc v |
| | We put to sea expecting an easy voyage, but the storm quickly forced us back to port. |
| | La tempête s'est levée dès que nous avons pris la mer. |
| put to sea v | (leave land, embark ) Mar | prendre la mer⇒ vtr |
| | They will all put to sea again after the sails have been repaired. |
| rough sea n | (stormy or choppy sea) | mer agitée nf |
| | The rough sea prevented him from returning from Capri port to Naples. |
| | La météo marine annonce une mer agitée. |
| | | mer houleuse nf |
| | | mer démontée nf |
| | | mer forte nf |
| sailor lost at sea | Nautique | péri en mer phrase |
| sea n | (smaller than ocean) | mer nf |
| | The Mediterranean is a sea, not an ocean. |
| | La Méditerranée est une merc, pas un océan. |
| sea n | (expanse of salt water) | mer nf |
| | The sea is home to thousands of different species of fish. |
| | La mer abrite des milliers d'espèces différentes de poissons. |
| sea n | (not land) | mer nf |
| | We will fight on land and sea. |
| | Nous combattrons par la terre et la mer. |
| sea n | (movement of the sea) maritimes | tempêtes nfpl |
| | Heavy seas caused the boat to sink. |
| | Les tempêtes ont fait couler le bateau. |
| sea n | (large quantity) de | nuée nf |
| | There is a sea of videos for sale in that store. |
| | Il y a une nuée de vidéos en vente dans ce magasin. |
| sea adj | (belonging to the sea) animal | de mer loc adj |
| | The sea turtle comes to the beach to mate. |
| | La tortue de mer vient sur la plage pour s'accoupler. |
| sea air | | air de la mer n |
| sea air | | air marin |
| sea anemone n | (tentacled marine creature) | anémone de mer nf |
| | | ortie de mer nf |
| sea anemones | | anémones de mer n |
| sea bass n | (variety of marine fish) | bar nm |
| | My favourite type of fish is sea bass. |
| | Le bar de ligne est un poisson recherché. |
| | méditerranée | loup nm |
| sea bed | | fond nm |
| sea biscuit | | biscuit de mer |
| sea blue | | bleu mer |
| sea bream | poisson comestible | daurade nf |
| sea bream | | dorade nf |
| sea breeze n | (gentle wind blowing in from the sea) | brise marine nf |
| | Although the temperatures in California are high, there is a constant sea breeze which makes the heat tolerable. |
| sea buckthorn | | argousier nm |
| sea buckthorn | Botanique | griset nm |
| sea captain n | (commander of a ship) | capitaine nm |
| | My Grandfather was a sea captain, the master of a merchant ship which was sunk in the Second World War. |
| | | commandant de vaisseau nm |
| sea chest | | malle-cabine nf |
| sea cliff | | falaise nf |
| sea cow n | (manatee) Zool (Steller's sea cow) | vache de mer nf |
| | In Costa Rica they take good care to preserve the sea cows. |
| | Les vaches de mer sont une espèce éteinte depuis 1768. |
| | Zool (manatee) | lamantin nm |
| | Les lamantins sont une espèce protégée car leur vie est menacée. |
| sea cucumber | | holothurie nf |
| sea dog n | figurative (veteran sailor) | (vieux) loup de mer nm |
| | Captain Ahab, whose face was scarred by lightening, was the ultimate seadog. |
| sea drift | | bois de grève nm |
| sea duty | | service en mer nm |
| sea eagle | | aigle de mer n |
| sea elephant | | éléphant de mer nm |
| sea fan | | gorgone nf |
| sea fish | | poisson de mer nm |
| sea fishing | | pêche en mer |
| sea glass n | (glass fragment worn smooth by the tide) | verre de mer nm |
| | Le verre de mer est un morceau de verre dépoli par l'action des marées et qu'on ramasse sur le littoral. |
| sea god | | dieu marin |
| sea green | | vert marin adj |
| sea ice n | (frozen ocean water) | banquise nf |
| | Le réchauffement des océans fait fondre la banquise. |
| sea lamprey | | lamproie nf |
| sea landing | action de se poser sur l'eau | amerrissage nm |
| sea legs | | s'habituer à la mer loc |
| sea level n | (sea's surface height) | niveau de la mer nm |
| | One third of the Netherlands is at or below sea level. |
| | What will happen if the sea level rises? |
| | Un tiers des Pays-Bas se trouve en dessous du niveau de la mer. |
| sea life n | (animals and plants of the ocean) | vie aquatique nf |
| | | faune et flore marines nfpl |
| sea lion n | (large seal) | lion de mer nm |
| | | otarie à crinière nf |
| | | lion marin nm |
| | Elle a pris des lions marins en photo lors de son voyage au Chili. |
| sea mark | marine | amer nm |
| sea mist n | (thin fog coming in off the sea) | brume marine nf |
| | | brouillard marin nm |
| sea mud | | boue marine |
| sea otter n | (marine mammal) | loutre de mer nf |
| | Sea otters are quick swimmers, but slow on land. |
| | De facétieuses loutres de mer se donnent en spectacle à l'aquarium public aux heures de repas. |
| sea perch | icthyology | loup de mer nm |
| sea power | | puissance navale nf |
| sea room | | mer libre |
| sea salt n | (salt extracted from the sea) | sel de mer nm |
| | I always cook with sea salt. |
| | | sel marin nm |
| | Les bains au sel marin sont censés être efficaces contre les rhumatismes. |
| sea sand | | sable marin nm |
| sea scallop n | (large edible marine mollusc) | coquille Saint-Jacques nf |
| sea serpent | (zoology) zoologie | serpent de mer nm |
| sea service | | service en mer nm |
| sea shanty | chanson de marin | chanson de matelot |
