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Webster 1913 Edition

(mō̍-nŏs′tĭ-kŭs)

Adj.

[See

(Bot.)

Arranged in a single row on one side of an axis, as the flowers in grasses of the tribe

Chloridae

monostichous ‎(not comparable)

(botany) Arranged in a single row on one side of an axis.
The flowers in grasses of the tribe Chloridae are monostichous.