Plane locus, a locus that is a straight line, or a circle.Solid locus, a locus that is one of the conic sections.

(Lo"cust) n. [L. locusta locust, grasshopper. Cf. Lobster.]

1. (Zoöl.) Any one of numerous species of long-winged, migratory, orthopterous insects, of the family Acrididæ, allied to the grasshoppers; esp., (Edipoda, or Pachytylus, migratoria, and Acridium perigrinum, of Southern Europe, Asia, and Africa. In the United States the related species with similar habits are usually called grasshoppers. See Grasshopper.

These insects are at times so numerous in Africa and the south of Asia as to devour every green thing; and when they migrate, they fly in an immense cloud. In the United States the harvest flies are improperly called locusts. See Cicada.

Locust beetle(Zoöl.), a longicorn beetle which, in the larval state, bores holes in the wood of the locust tree. Its color is brownish black, barred with yellow. Called also locust borer.Locust bird(Zoöl.) the rose-colored starling or pastor of India. See Pastor.Locust hunter(Zoöl.), an African bird; the beefeater.

2. [Etymol. uncertain.] (Bot.) The locust tree. See Locust Tree (definition, note, and phrases).

Locust bean(Bot.), a commercial name for the sweet pod of the carob tree.

(Loc"u*lose` Loc"u*lous) a. [L. loculosus. See Loculament.] (Bot.) Divided by internal partitions into cells, as the pith of the pokeweed.

(Loc"u*lus) n.; pl. Loculi [L., little place, a compartment.]

1. (Zoöl.) One of the spaces between the septa in the Anthozoa.

2. (Bot.) One of the compartments of a several-celled ovary; loculament.

Locum tenens
(||Lo"cum te"nens) [L., holding the place; locus place + tenens, p. pr. of tenere to hold. Cf. Lieutenant.] A substitute or deputy; one filling an office for a time.

(Lo"cus) n.; pl. Loci & Loca [L., place. Cf. Allow, Couch, Lieu, Local.]

1. A place; a locality.

2. (Math.) The line traced by a point which varies its position according to some determinate law; the surface described by a point or line that moves according to a given law.

  By PanEris using Melati.

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