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Any plant of a genus (Eriocaulon) of aquatic or marsh herbs with soft grass-like leaves.

circle, or other curve; as, the plane of an orbit; the plane of the ecliptic, or of the equator.

A small-leaved North American tree (Planera aquatica) related to the elm, but having a wingless, nutlike fruit.

rld. Indian plantain. (Bot.) See under Indian. -- Mud plantain, a homely North American aquatic plant (Heteranthera reniformis), having broad, reniform leaves. -- Rattlesnake plantain, an orchidaceous plant (Goodyera pubescens), with the leaves blotched and spotted with white. -- Ribwort plantain. See Ribwort. -- R…

Full or adequate supply; enough and to spare; sufficiency; specifically, abundant productiveness of the earth; ample supply for human wants; abundance; copiousness. "Plenty of corn and wine." Gen. xxvii. 28. "Promises Britain peace and plenty." Shak. Houses of office stuffed with plentee. Chaucer. The teeming clouds De…

The system of equations required for the complete expression of the relations which exist between a set of quantities. Brande & C.

point; as, polar coördinates. Polar axis, that axis of an astronomical instrument, as an equatorial, which is parallel to the earths axis. -- Polar bear (Zoöl.), a large bear (Ursus, or Thalarctos, maritimus) inhabiting the arctic regions. It sometimes measures nearly nine feet in length and weighs 1,600 pounds. It is…

plants, which includes the true thorn trees, the quinces, service berries, medlars, and loquats, as well as the apples, pears, crabs, etc.

Any aquatic plant of the genus Potamogeton, of which many species are found in ponds or slow-moving rivers. Choke pondweed, an American water weed (Anarcharis, or Elodea, Canadensis.) See Anacharis. -- Horned pondweed, the Zannichellia palustris, a slender, branching aquatic plant, having pointed nutlets.…

Inadequate; insufficient; insignificant; as, a poor excuse. That I have wronged no man will be a poor plea or apology at the last day. Calamy.

g to the period immediately following the Pliocene; Pleistocene. Also used as a noun. See Quaternary.

Following, or more recent than, the Tertiary; Quaternary.

Being potent; endowed with energy adequate to a result; efficacious; influential. [Obs.] "And hath in his effect a voice potential." Shak.

the action of the sun, moon, and planets, upon the protuberant matter about the earth's equator, in connection with its diurnal rotation; -- so called because either equinox, owing to its westerly motion, comes to the meridian sooner each day than the point it would have occupied without the motion of precession, and…

granite, gneiss, etc.; -- called also primitive rocks. The terms Secondary, Tertiary, and Quaternary rocks have also been used in like manner, but of these the last two only are now in use. -- Primary salt (Chem.), a salt derived from a polybasic acid in which only one acid hydrogen atom has been replaced by a base or…

jections are made, generally coinciding with some principal circle of the sphere, as the equator or a meridian. -- Primitive rocks (Geol.), primary rocks. See under Primary. -- Primitive sheath. (Anat.) See Neurilemma. -- Primitive streak or trace (Anat.), an opaque and thickened band where the mesoblast first appea…

are straight lines whose distance from each other increases with their distance from the equator, so that at all places the degrees of latitude and longitude have to each other the same ratio as on the sphere itself. -- Oblique projection, a projection made by parallel lines drawn from every point of a figure and meet…

An order of aquatic amphibians having prominent external gills and four legs. It includes Proteus and Menobranchus (Necturus). Called also Proteoidea, and Proteida.

A genus of aquatic eel-shaped amphibians found in caves in Austria. They have permanent external gills as well as lungs. The eyes are small and the legs are weak.

e plant (Arenaria peploides) with crowded opposite fleshy leaves. -- Water purslane, an aquatic plant (Ludwiqia palustris) but slightly resembling purslane.