someone who is only knowledgeable within the field in which they specialize; a fachidiot

(colloquial) current boyfriend

everything

(slang) Alternative form of 彼氏 (kareshi, “boyfriend”)

everyone, one and all

下学: elementary learning / 下顎: lower jaw / 化学: chemistry / 科学: science / 家学: hereditary learning / 歌学: poetry

下顎: lower jaw / 寡額: minimum amount set for a fine / 価額: value, amount

医学: medicine, medical science, the study of medicine

雅楽: the ancient court ritual music of Japan, of Chinese and Korean origin

生態学: ecology / 生体学: somatology