ped ‧ ant /ˈpednt/ BrE AmE noun [countable]
[ Date: 1500-1600 ; Language: French ; Origin: pédant , from Italian pedante , perhaps from Latin paedagogus ; ⇨ ↑ pedagogy ]
someone who pays too much attention to rules or to small unimportant details, especially someone who criticizes other people in an extremely annoying way:
‘That’s not exactly what it means.’ ‘Pedant.’
—pedantry noun [uncountable]