Wiktionary
subquark
n. Any of several hypothetical particles construed as subcomponents of quark (& lepton).
Usage examples of "subquark".
Cutthroats, ready to pounce on every datum and analyze it to the subquark level, then call it into question, they had done everything but throw rotten fruit at him.
After the stasis field was destroyed, the subquark particles recombined.