preeruptive en · ADJ
Etymology
From pre- + eruptive.
Meanings
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(not-comparable) Prior to the formation of eruptions
We find a distinctive sequence of three activation periods each of them containing preeruptive precursors such as a brightening and enlarging of the prominence body followed by small surge- like ejections from its southern end observed in the radio 17 GHz.
2016, P. Duchlev, K. Kolevaa, M. S. Madjarska, M. Dechev, “Homologous prominence non-radial eruptions: A case study”, in arXiv: