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lass Pteridophyta. Cf. Cellular plants, Cellular. -- Vascular system (Bot.), the body of associated ducts and woody fiber; the fibrovascular part of plants. -- Vascular tissue (Bot.), vegetable tissue composed partly of ducts, or sap tubes. -- Water vascular system (Zoöl.), a system of vessels in annelids, nemertean…

A wind associated with a volcanic outburst and due to the eruption or to convection currents over hot lava.

A vicious habit of a horse, consisting in the swallowing of air; -- usually associated with crib-biting, or cribbing. See Cribbing, 4.

To be joined or associated; to be intimately connected; to consort closely; to mate. We 'll yoke together, like a double shadow. Shak.

An associate or companion in, or as in; a mate; a fellow; especially, a partner in marriage. Phil. iv. 3. The two languages [English and French] became yokefellows in a still more intimate manner. Earle. Those who have most distinguished themselves by railing at the sex, very often choose one of the most worthless for…

A rare element of the boron group, sometimes associated with yttrium or other related elements, as in euxenite and gadolinite. Symbol Yb; provisional atomic weight 173.2. Cf. Yttrium.

A kind of mica containing lithium, often associated with tin ore.