Chemical defenses are widespread and are mostly based on chemicals of plant origin.

Wicker is often made of material of plant origin, but plastic fibers are also used.

This term may even have extended to plant galls, as they were thought to be of plant origin (see oak apple).

The new formulation is known to be of plant origin, using calcium oxide in order to gauge color depth.

Other drugs of plant origin used in ulcer therapy are the alkaloids.

The larvae probably feed on animal fibre or refuse of plant origin.

Antithiamins of plant origin: their chemical nature and mode of action.

Some of us have reservations, perhaps, about the extension of these provisions, as they stand, to products of plant origin.

Products of plant origin, for example, cereals, leguminous crops, vegetables, fruit and wood, are also included in this.

It is usually of plant origin, but often includes some animal dung or bedding.