The Collaborative International Dictionary
Preinstructing
Preinstruct \Pre`in*struct"\, v. t. [imp. & p. p.
Preinstructed; p. pr. & vb. n. Preinstructing.]
To instruct previously or beforehand.
--Dr. H. More.
Wiktionary
preinstructing
vb. (present participle of preinstruct English)