電子工学: electronics / 電子光学: electron optics

lightning speed

(historical) Short for 邪馬台国 (Yamatai-koku): Yamatai

child

an object which has a subservient or derivative role relative to another object

suffix used in female given names, such as 智子 (Tomoko), 英子 (Eiko), 秀子 (Hideko), 美奈子 (Minako) / (rare) suffix used in male given names

a surname

a child / Short for 子爵 (shishaku): the fourth rank of nobility in Meiji-postwar Japan, equivalent to a viscount / an honorific for a learned man, such as teacher or master

(archaic) second-person pronoun: you (of one's equals)

(Chinese astrology) Rat, the first of the twelve Earthly Branches