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prequark
prequark n. 
/ˈpriˌkwɑrk/ Particle Physics a hypothetical particle postulated as a constituent of quarks; = preon n.
Brit. /ˈpriːkwɑːk/
, /ˈpriːkwɑːk/U.S. /ˈpriˌkwɔrk/
, /ˈpriˌkwɔrk//ˈpriˌkwɑrk/ΚΠ
1976 J. C. Pati & A. Salam in A. Zichichi High Energy Physics (Proc. European Physical Soc. Internat. Conf., Palermo) I. 154 The suggestion that quarks and leptons, themselves, are made out of pre-quarks and pre-bosons.
1999 Dallas Morning News (Nexis) 5 Apr. d7 We can't be sure that there aren't still smaller things, that quarks aren't made of prequarks or subquarks or something.
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as lemmas