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A preliminary or auxiliary proposition demonstrated or accepted for immediate use in the demonstration of some other proposition, as in mathematics or logic.

A leman. [Obs.] Chaucer.

An orthographic projection of the sphere on the plane of the meridian, the eye being supposed at an infinite distance, and in the east or west point of the horizon.

ursue; a vexatious alternative or predicament; a difficult choice or position. A strong dilemma in a desperate case! To act with infamy, or quit the place. Swift. Horns of a dilemma, alternatives, each of which is equally difficult of encountering.

The basal substance of the cell nucleus; a hyaline or granular substance, more or less fluid during life, in which the other parts of the nucleus are imbedded.

Sarcolemma.

The delicate outer sheath of a nerve fiber; the primitive sheath.

sparent and apparently homogenous sheath which incloses a striated muscular fiber; the myolemma.

propositions, the major premises of which are disjunctively affirmed in the minor. See Dilemma.

A fallacious dilemma, mythically supposed to have been first used by a crocodile. Crocodile bird (Zoöl.), an African plover (Pluvianus ægypticus) which alights upon the crocodile and devours its insect parasites, even entering its open mouth (according to reliable writers) in pursuit of files, etc.; -- called also Nile…

Difficult situation; dilemma; strait. [Obs.] "I stand in such disjoint." Chaucer.

ich a railway car axle box slides up and down; -- also called horn plate. -- Horn of a dilemma. See under Dilemma. -- Horn distemper, a disease of cattle, affecting the internal substance of the horn. -- Horn drum, a wheel with long curved scoops, for raising water. -- Horn lead (Chem.), chloride of lead. -- Horn…

nnective tissue sheath which surrounds a bundle of nerve fibers. See Epineurium, and Neurilemma.

mental part of muscle fibers, a thick, viscid, albuminous fluid contained within the sarcolemma, which on the death of the muscle coagulates to a semisolid mass.

e 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 appears in the vertebrate blastoderm.

The neurilemma.

y to destruction; to put an end to; to ruin; to undo. "Sped with spavins." Shak. A dire dilemma! either way I 'm sped. If foes, they write, if friends, they read, me dead. Pope.