Opiate Used in Medicine for Strong Pain Relief

This page is the CodyCross answer for the clue below from Water Park, Group 747, Puzzle 3 (Bridges and Tunnels).

Question is: Opiate Used in Medicine for Strong Pain Relief

and the answer is: MORPHINE

Word Meaning:

MORPHINE — (biochemistry, pharmacology) A crystalline alkaloid (4,5-epoxy-17-methyl-7,8-didehydromorphinan-3,6-diol), extracted from opium, the salts of which are soluble in water and are used as analgesics, anaesthetics and sedatives; it is one of a group of morphine alkaloids.

Definitions from Wiktionary.