The Collaborative International Dictionary of English v.0.48:
Hemp \Hemp\ (h[e^]mp), n. [OE. hemp, AS. henep, h[ae]nep; akin
to D. hennep, OHG. hanaf, G. hanf, Icel. hampr, Dan. hamp,
Sw. hampa, L. cannabis, cannabum, Gr. ka`nnabis, ka`nnabos;
cf. Russ. konoplia, Skr. [,c]a[.n]a; all prob. borrowed from
some other language at an early time. Cf. Cannabine,
1. (Bot.) A plant of the genus Cannabis (Cannabis
sativa), the fibrous skin or bark of which is used for
making cloth and cordage. The name is also applied to
various other plants yielding fiber.
2. The fiber of the skin or rind of the plant, prepared for
spinning. The name has also been extended to various
fibers resembling the true hemp.
African hemp, Bowstring hemp. See under African, and
Bastard hemp, the Asiatic herb Datisca cannabina.
Canada hemp, a species of dogbane (Apocynum cannabinum),
the fiber of which was used by the Indians.
Hemp agrimony, a coarse, composite herb of Europe
(Eupatorium cannabinum), much like the American boneset.
Hemp nettle, a plant of the genus Galeopsis (Galeopsis
Tetrahit), belonging to the Mint family.
Indian hemp. See under Indian, a.
Manila hemp, the fiber of Musa textilis.
Sisal hemp, the fiber of Agave sisalana, of Mexico and
Sunn hemp, a fiber obtained from a leguminous plant
Water hemp, an annual American weed (Acnida cannabina),
related to the amaranth.