https://www.merriam-webster.com/dictionary/subsize
SUBSIZE Definition & Meaning - Merriam-Webster
The meaning of SUBSIZE is of less than usual, standard, or normal size.
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https://www.ornl.gov/publication/assessing-viability-new-subsize-tensile-specimen-geometry-evaluation-structural-nuclear
Assessing the viability of a new subsize tensile specimen geometry for evaluation of structural...
The use of subsize specimens in nuclear materials testing has been a subject of ongoing interest due to radiation safety concerns and resource conservation...