horse botfly
A parasitic fly (Gasterophilus intestinalis) whose larvae infest the stomach of horses. The name literally means 'horse fly', but it is distinct from the common horsefly (アブ).
The larvae of the horse botfly parasitize the stomach of horses.
I saw a horse botfly at the ranch.
Katakana spelling is common for this insect name; usually written in kana.
Kanji spelling using 蠅 (fly); rarely used in modern writing.
Kanji spelling using 蝿 (fly); rarely used in modern writing.
Compound of 馬 (uma, 'horse') + 蠅 (hae, 'fly'). The kanji 蝿/蠅 are rarely used; the word is normally written in kana.