exusion

plural exusions

1. countableuncountableThe act or process of exuding.
2. countableuncountableSomething that is exuded.

   […] and that, while the former affords an appropriate matrix or bed, wherein the granular exusions from the scion may affix themselves and be secured, the latter keeps up that supply of moisture which is required, till the union is completely effected.

   1830, John Towers, The Domestic Gardener's Manual, page 526