in·still also in·stil (ĭn-stĭl)
tr.v. in·stilled, in·still·ing, in·stills also in·stils
1. To introduce by gradual, persistent efforts; implant: "Morality ... may be instilled into their minds" (Thomas Jefferson).
2. To pour in (medicine, for example) drop by drop.
[Middle English instillen, from Latin īnstīllāre : in-, into; see IN-2 + stīllāre, to drip, drop (from stīlla, drop).]
in′stil·lation (ĭn′stə-lāshən) n.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.