Noun

1. A series of things depending on each other as if linked together
2. (chemistry) a series of linked atoms (generally in an organic molecule)
3. A series of (usually metal) rings or links fitted into one another to make a flexible ligament
4. (business) a number of similar establishments (stores or restaurants or banks or hotels or theaters) under one ownership
5. Anything that acts as a restraint
6. A unit of length
7. British biochemist (born in germany) who isolated and purified penicillin, which had been discovered in 1928 by sir alexander fleming (1906-1979)
8. A series of hills or mountains
9. A linked or connected series of objects
10. A necklace made by a stringing objects together

Verb

1. Connect or arrange into a chain by linking
2. Fasten or secure with chains