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Webster 1913 Edition

Adj.

[LL.

amentaceus

(Bot.)

(a)

Resembling, or consisting of, an ament or aments;

as, the chestnut has an

amentaceous

inflorescence

(b)

Bearing aments; having flowers arranged in aments;

as,

amentaceous

plants

Adj.

Growing in an ament; resembling; a thong; as, the chestnut has an amentaceous inflorescence.

amentaceous ‎(comparative more amentaceous, superlative most amentaceous)

(botany) Bearing, resembling, or consisting of an ament or aments.
The chestnut has an amentaceous inflorescence.