Etimology
From Middle English techere, equivalent to teach + -er. More at teach.
noun
teacher (plural teachers)
A person who teaches, especially one employed in a school.
The index finger; the forefinger.
An indication; a lesson.
(Mormonism) The second highest office in the Aaronic priesthood, held by priesthood holders of at least the age of 14.
Examples
One particularly damaging, but often ignored, effect of conflict on education is the proliferation of attacks on schools […] as children, teachers or school buildings become the targets of attacks. Parents fear sending their children to school. Girls are particularly vulnerable to sexual violence.
But if the last two years are a teacher, look for the bombastic tweets to resume before sunrise.
Related words
synonyms
(person who teaches): preceptor, educator
(index finger): See Thesaurus:index finger