Dolly __ Was the Name of the First Cloned Sheep
Puzzle 1 of Things to be Grateful For Hard Pack
Question is: Dolly __ Was the Name of the First Cloned Sheep
and the answer is: PARTON
Word Meaning:
PARTON — (physics, dated or historical) Any of the constituent particles making up a compound particle, e.g. the quarks and gluons which make up hadrons.
Definitions from Wiktionary.