SES'SILE, adjective [Latin sessilis. See Set.] In botany, sitting on the stem. A sessile leaf issues directly from the stem or branch, without petiole or footstalk. A sessile flower has no peduncle. Sessile pappus or down has no stipe, but is placed immediately on the seed.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.