an enemy / revenge, vengeance / opponent (of the game or conflict) / (archaic, obsolete) marriage partner

的: (historical) (by extension from the red-light district usage) term of third-person reference: that guy, that one

enemy / foe

to rival

attach, affix, stick, fasten, add, add on, append; set, put, put one thing on another / apply, put on / leave a mark on / write, make an entry / give, impart, direct, direct one's attention

be accustomed to, be used to / perform an action vigorously, perform an action vehemently / perceive, detect

give, impart, provide with

薬科: pharmacy

八つ: eight things

(archaic, dialect) “isn't it?” / (archaic, dialect) expresses uncertainty or indefiniteness