(botany) Any plant that does not have a vascular system

(geometry) An angle formed by two intersecting straight lines.

(biochemistry) Any of many substances, produced by plants, that control or regulate their germination, growth, metabolism etc.

plural of plant hormone

(differential geometry) Given a point P on a surface M, the tangent plane of M at point P, denoted by T_P(M), is the plane passing through P which contains the tangent lines of all the curves on M passing through P.

An agave (Agave americana) originally from Mexico but cultivated worldwide.

(astronomy) Any of many small, solid astronomical objects that orbit a star and form protoplanets through mutual gravitational attraction.

(astronomy) Being or relating to one of these astronomical objects.

An aircraft that flies alongside another, to advise or photograph it while experimental flights are being carried out.

A small-scale chemical engineering facility designed to research the full-scale production of a product.