| feline leukaemia-sarcoma virus complex | Viruses from cats that induce transmissible leukaemia or transmissible fibrosarcoma in kittens. (05 Mar 2000) |
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| femininity complex | In psychoanalysis, the unconscious fear, in boys and men, of castration at the hands of the mother with resultant identification with the aggressor and envious desire for breasts and vagina. (05 Mar 2000) |
| lcm-lassa complex viruses | One of two groups of viruses in the arenavirus genus and considered part of the old world complex. It includes lassa virus and lymphocytic choriomeningitis virus, although the latter has worldwide distribution now. (12 Dec 1998) |
| Lear complex | A father's libidinous fixation on a daughter. Origin: Lear, Shakespearean character (05 Mar 2000) |
| lytic complex | <immunology> The large (2000 kD) cytolytic complex formed from complement C5b6789. See: complement. (18 Nov 1997) |