tra-, tract-, trac-, -tractive, -traction, -tracting, treat-, trai-

(Latin: drag, draw together; a drawing out or pulling)

attraction
attractive
attractively
attractiveness
attractor, attracter
Someone who arouses or compels the interest, admiration, or attention of others.
autoabstract, auto-abstract, automatic abstracting
1. To select key words from a document, commonly by an automatic or machine method, for the purpose of forming an abstract of the document.
2. A proces of automatically selecting key words and phrases which represent the basic content of a document; often using statistical or counting techniques.
3. The material abstracted from a document by machine methods.
chemoattractants
Chemical substances that influence the migration of cells.
contract (s), contract (pl) (nouns)
contract (verb), contracts; contracted; contracting
contractible
contractile
contractility
contraction
1. A shrinking or reducing of something.
2. A tightening or narrowing of a muscle, organ, or other body part.
3. In grammar, a shortened form or shortening of a word or phrase; such as, "he'll" for he will; "they'll" for they will; "won't" from will not; or the phrase, "o'clock" for of the clock resulting in the omission or combining some of the sounds of a longer phrase.

In English, the omitted letter or letters are usually marked with an apostrophe or a period, depending on the type of contraction.

contractive
contractively