The Commens Dictionary
Quote from ‘Nomenclature and Divisions of Dyadic Relations’
By a seed (granum) of an existential relation is to be understood an existing individual which not only stands in that relation to some correlate, but to which also some relate stands in that relation. By a spike of a relation is to be understood any collection of seeds of it of which it is both true that every one of them stands in that relation to some one of them; and it is also true that to every one seed of the spike some seed of the spike stands in that same relation. Thus, two spikes of the same relation may have common seeds, or one may even be a part of another. A simple spike is a spike not containing any other spike as a part of it.
‘Spike’ (pub. 14.08.17-09:02). Quote in M. Bergman & S. Paavola (Eds.), The Commens Dictionary: Peirce's Terms in His Own Words. New Edition. Retrieved from http://www.commens.org/dictionary/entry/quote-nomenclature-and-divisions-dyadic-relations-8.