Kyūjitai form of 潮汐学

academic major

specialize in, major in

tide

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

(physics) tidal force

(sciences) tidology

everything