interrogatory (adj.)

"containing or expressing a question," 1570s, from Late Latin interrogatorius "consisting of questions," from past participle stem of Latin interrogare "to ask, question, inquire; interrogate judicially, cross-examine," from inter "between" (see inter-) + rogare "to ask, to question," apparently a figurative use of a PIE verb meaning literally "to stretch out (the hand)," from root *reg- "move in a straight line."