Webster's 1913 Dictionary
STIGMARIA
Stig *ma "ri *a, n. Etym: [NL. See Stigma. ] (Paleon.)
Defn: The fossil root stem of a coal plant of the genus Sigillaria.
New American Oxford Dictionary
stigmaria
stig mar i a |stigˈme (ə )rēə stɪɡˈmɛriə | ▶noun ( pl. stigmariae |-ˈme (ə )rē -ē | ) Paleontology a fossilized root of a giant lycopod, common in Carboniferous coal measures. [Class Lycopsida, in particular the genera Lepidodendron and Sigillaria. ] DERIVATIVES stig mar i an adjective ORIGIN mid 19th cent.: modern Latin, from Greek stigma, with reference to the scars where rootlets were attached, covering the fossils.
Oxford Dictionary
stigmaria
stigmaria |stɪgˈmɛːrɪə | ▶noun ( pl. stigmariae |-ˈmɛːrɪiː | ) Palaeontology a fossilized root of a giant lycopod, common in Carboniferous coal measures. ●Class Lycopsida, in particular the genera Lepidodendron and Sigillaria. DERIVATIVES stigmarian adjective ORIGIN mid 19th cent.: modern Latin, from Greek stigma, with reference to the scars where rootlets were attached, covering the fossils.
The Wordsmith Dictionary