IPA: /ɪnˈstrʌktrəs/
KK: /ɪnˈstrʌktrəs/
A woman who teaches or provides instruction, especially in a formal setting.
The instructress guided the students through the complex material with patience.
Instructress → It is formed from "instruct" (from Latin "instruere", meaning to build up or prepare) and the suffix "-ess" (meaning a female). The word "instructress" refers to a female instructor or teacher, someone who builds up knowledge in others.
Think of someone who 'builds up' knowledge ('instruere') and is a 'female' ('-ess') — that's why an instructress is a female teacher.