To reproduce or renew something that was lost. For example, after an injury, the liver has the capacity to regenerate.

mid-15c., from Latin regeneratus, past participle of regenerare "bring forth again" (see regeneration).

1550s, back-formation from regeneration or else from Latin regeneratus, past participle of regenerare "bring forth again" (see regeneration). Originally religious; of body parts from 1590s. [..]

v. To reproduce.

(transitive) To construct or create anew, especially in an improved manner (transitive) To revitalize (context, transitive, biology) To replace lost or damaged tissue (intransitive) To become reconstr [..]

(v) reestablish on a new, usually improved, basis or make new or like new(v) amplify (an electron current) by causing part of the power in the output circuit to act upon the input circuit(v) bring, le [..]

to replace a lost or damaged organ or part through formation of new tissues.

Formed or created again.

The ability to grow back part of a body that was lost. Crayfish can regenerate a lost leg, and earthworms can regenerate lost segments.

Regrow, renew or restore portion of body, usually over a series of moults. In crustaceans.

To replace lost parts.

In the paper industry, lime is used in the chemical pulp-making process to recover and regenerate Na(OH), which is a reagent used to extract cellulose fibers from wood. 

The solution used to restore the activity of an ion exchanger. Acids are employed to restore a cat ion exchanger to its hydrogen form; brine solutions may be used to convert the cat ion exchange to th [..]