(analytic geometry, projective geometry) A complex line (especially, the set of complex numbers regarded as such) endowed with a point at infinity (thus becoming a projective line); (more formally) the set of equivalence classes of ordered pairs (α, β) of complex numbers, not both zero, with respect to the equivalence relation "(α, β) ≡ (λα, λβ) for all nonzero complex λ".

plural of complex projective line

(immunology) A structure, typically formed on the surface of a pathogen cell membrane as a result of the activation of the host's complement system, creating transmembrane channels that disrupt the cell membrane, leading to cell lysis and death.

(pathology) A transcription disorder that causes failures of expression causing the lack of advancement in development from the state found as a neonatal resulting from genetic anomalies. A developmental disorder that is a state of permanent neoteny, staying in the state of an infant.

(medicine, pathology) A prodromal phase of infection with the human immunodeficiency virus.

(psychoanalysis) A complex said to develop in men who see women as either saintly "Madonnas" or debased prostitutes, potentially leading to the inability to maintain sexual arousal within a committed, loving relationship.

plural of split-complex number

(biochemistry) A complex of several proteins which is activated during mitosis to initiate the anaphase

(mathematics) An element of the two-dimensional algebra over the field of real numbers which contains an element ȷ ≠ 1 satisfying ȷ² = 1.

(inorganic chemistry) A complex, typically of a transition element, in which the hybridization of the central metal atom utilizes d orbitals from the shell inside that of the outermost occupied shell