tag- / Indo-European roots
Examples of words with the root tag-: attain, contact, contaminate, entire, intact, integer, integrate, integrity, tact, tactoreceptor, tangent, tangible, tangoreceptor, taste, tax.
To touch, handle.
1. Nasalized form *ta-n-g-. tact, tangent, tangible, task, taste, tax; attain, contact, intact from Latin tangere, to touch, with derivatives taxāre, to touch, assess (possibly a frequentative of tangere, but probably influenced by Greek tassein, taxai, to arrange, assess), and tāctus, touch.
2. Compound form *n̥-tag-ro-, "untouched, intact" (*n̥-, negative prefix; see ne) entire, integer, integrate, integrity from Latin integer, intact, whole, complete, perfect, honest.
3. Suffixed form *tag-smen-. contaminate from Latin contāmināre, to corrupt by mixing or contact (< *con-tāmen-, "bringing into contact with"; con-, com-, with; see kom)
[Pokorny tag- 1054.]