‖Sig′il‐la″ri‐a, n. [NL., fem sing. fr. L. sigillum a seal.] (Paleon.) A genus of fossil trees principally found in the coal formation; — so named from the seallike leaf scars in vertical rows on the surface.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.