(archaic) eldest son / (archaic) a senior / (archaic) (by extension) an elder sibling / (archaic) the head of a clan / (archaic) a skilled craftsman

elder/older brother / honorific referencing an older brother figure

attaches to a name referencing an older brother figure: Mister, Mr.

核物理学: nuclear physics

古生物学: paleontology

鉱物学: mineralogy

動物学: zoology

(chiefly women's speech) first person singular pronoun: I, me

marine biology

molecular biology