Someone With No Siblings
This page is the CodyCross answer for the clue below from Health and Fitness, Group 2132, Puzzle 5 (Resting Metabolism).
Question is: Someone With No Siblings
and the answer is: ONLYCHILD
Word Meaning:
ONLY CHILD — A person who has no siblings; a person raised as the sole child in a household.
Definitions from Wiktionary.