The Collaborative International Dictionary
Sigillarid
Sigillarid \Sig`il*la"rid\, n. (Paleon.) One of an extinct family of cryptagamous trees, including the genus Sigillaria and its allies.
Wiktionary
sigillarid
n. (context paleontology English) One of an extinct family of cryptogamous trees, including the genus ''Sigillaria'' and its allies.