海豚（いるか、iruka）
- dolphin

The Japanese word 海豚, pronounced いるか (iruka), refers to a dolphin. It's a general term used to describe various species of dolphins found in the ocean. This includes bottlenose dolphins, spinner dolphins, and many others. These are marine mammals known for their intelligence, playful nature, and streamlined bodies. The word 海豚 literally translates to "sea pig," but the modern usage refers exclusively to dolphins.

⚫︎イルカは水族館で人気があります。 Translation: Dolphins are popular at aquariums. ⚫︎子供たちはイルカのショーを見て大喜びしました。 Translation: The children were very happy watching the dolphin show. ⚫︎海で海豚に出会えたら嬉しいな。 Translation: I would be happy if I could meet a dolphin in the sea.

You can use 海豚 in a variety of contexts when talking about dolphins. This includes: ⚫︎ Describing the animals themselves. ⚫︎ Talking about dolphin habitats. ⚫︎ Referring to dolphin performances or shows. ⚫︎ Mentioning dolphins in stories or documentaries.

海豚 is typically written in kanji as 海豚, but it's more commonly written in hiragana as いるか. Katakana is rarely used, but it can be used if you want to emphasize the word or give it a foreign feel. There are no variations in okurigana. It's always written as イルカ.

There aren't many direct synonyms for 海豚 in Japanese, as it is a specific word. However, you might use more descriptive phrases such as: ⚫︎ イルカの仲間(iruka no nakama) - meaning "dolphin's group/kin", which implies "dolphins" in general.

There is no direct antonym for 海豚.

夏休みにイルカと一緒に泳ぎたいです。 ・Translation: I want to swim with dolphins during the summer vacation. ・Explanation: This sentence expresses a desire to interact with 海豚 during the summer.

この水族館にはたくさんの種類の海豚がいます。 ・Translation: This aquarium has many kinds of dolphins. ・Explanation: This sentence describes the variety of 海豚 at a particular aquarium.

The etymology of 海豚 is a bit uncertain. It's believed that the "海" (umi) meaning "sea" and "豚" (buta) meaning "pig" were combined. It's thought to be because of the dolphin's shape, body fat, or their behavior compared to a pig. This is a purely descriptive naming, not reflecting their biological relationship to pigs.