Latinization of French sycône,
a vernacularized form of New Latin syconus,
derivative of Greek sŷkon
"fig" (probably erroneously construed as *sykon-, *sýkōn,
an n-stem, from which *sykṓnion,
Latinized as syconium,
would be formally a diminutive) — more at 1fig
The form syconium perhaps first appears in Elements of Botany and Vegetable Physiology (Edinburgh, 1831), an English translation by W. MacGillivray of Achille Richard's Nouveaux élémens de botanique et de physiologie végétale, 4. édition (Paris, 1828), where it renders Richard's sycône. Richard attributes the coinage (p. 332) to the botanist Charles François Brisseau de Mirbel (1776-1854), who does in fact use sycône in his Élémens de physiologie végétale et de botanique (Paris, 1815), p. 347 and p. 825, where he gives the Latin equivalent as syconus.