i Register
In some senses, hist is marked as dated, US. Watch for register when choosing this word.
noun
History (in journal titles such as "J Hist Neurosci" - "Journal of the History of Neuroscience").
intj
An utterance used to discreetly attract someone's attention.
An injunction to be silent and/or to pay attention to what is being said or can be heard.
"My worthy Nelly! I am greatly rejoiced to find it is no other than thee. Hist! child, hist! Should Ishmael gain a knowledge of our plans, he would not hesitate to cast us both from this rock, upon the plain beneath. Hist! Nelly, hist!"
1850, Edgar Allan Poe, Scenes from "Politian", 2009 [1902], Charles F. Richardson (editor), The Complete Works of Edgar Allan Poe, Volume 1: Poems, page 87, Hist! hist! thou canst not say / Thou hearest not now Baldazzar?,
noun
An instance of an exclamation attracting attention or injunction to be silent.
'A tinker!' repeated Sir Hugh, quite loud, in defiance of the signs and hists! hists! of Camilla, 'good lack! that's a person I should never have thought of!'