Lexic.us

2. Noun. (uncountable pediatrics) Poor physical growth or level of weight, relative to one's age peers. ¹

3. Noun. (uncountable medicine especially geriatrics) Abnormal weight loss, malaise. ¹

4. Noun. (countable medicine) Instances of poor physical growth or of abnormal weight loss. ¹

¹ Source: wiktionary.com

Medical Definition of Failure to thrive

1. A clinical finding in infants often associated with poor weight gain, malnutrition, poor feeding and a weight for age that is less than the 5th percentile. (27 Sep 1997)

Lexicographical Neighbors of Failure To Thrive

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