premetamorphic en · ADJ
Etymology
From pre- + metamorphic.
Meanings
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(not-comparable) Prior to metamorphosis
The lateral parts of these rhombic lips are more massive (Larsell's auricular lobes) and continue to increase in size dorsally and medially throughout the premetamorphic period.
2014, Rudolf Nieuwenhuys, The Central Nervous System of Vertebrates, page 1230: