interfirst en · ADJ
Etymology
From inter- + first. A recent coinage; see usage notes.
Meanings
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(nonstandard, not-comparable) Between the members of the first pair of specified things (such as premolars or molars).
Further corroborating these findings, Vajaria el al 11 also found expansion in interfirst premolar distances.
2015, Marcio Rodrigues de Almeida et al., “Dentoalveolar mandibular changes with self-ligating versus conventional bracket systems: A CBCT and dental cast study”, in Dental Press Journal of Orthodontics, volume 20, →DOI: