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loss aversion

In psychology and economics, the principle that individuals are more likely to make decisions that minimize their losses than maximize their gains, i.e., that a loss is more uncomfortable than an equal-sized gain is pleasurable.

lost to follow-up

In clinical medicine and research, not returning for continued care or evaluation, e.g., because of death, disability, relocation, or dropping out. SEE: dropout.


left occipitotransverse fetal position. SEE: presentation for illus.


In the pharmaceutical industry, a batch of a drug made at one time during a single manufacturing run.


SEE: benazepril.


(lō′shŭn) [L. lotio] A liquid medicinal preparation for local application to, or bathing of, a part.


Licensed Occupational Therapist.


The perceived intensity of sound. It often reflects the amplitude and frequency of a sonic stimulus, but because it varies from person to person, it is a subjective, rather than a purely measurable entity. SEE: decibel.

loudness discomfort level

ABBR: LDL. The intensity of sound, in decibels, that people identify as too loud, e.g., dangerous, painful, or unpleasant. The LDL for many individuals is between 90 and 100 dB. SYN: uncomfortable loudness level.

Lou Gehrig disease

Motor neuron disease.


(loop) [Fr.] A magnifying lens used in the form of a monocular or binocular lens. Surgeons, dentists, jewelers, and watchmakers frequently use this device.


(lows) Pediculus.

body l. SEE: Pediculus humanus corporis.

head l. SEE: Pediculus humanus capitis. SEE: illus.




SOURCE: Centers for Disease Control and Prevention; James Gathany



(low′zē-nĕs) Pediculosis.


(lŏv′ăj) A perennial herb (Levisticum officinale) and the sole species of the genus Levisticum, used in cooking and in herbal medicine as a diuretic. The herb has been approved in Germany for irrigation therapy to treat urinary tract inflammation and to prevent kidney stones.


1. Profound concern and affection for another person. 2. In psychoanalysis, love may be equated with pleasure, particularly as it applies to the gratifying sexual experiences between individuals.

low birth weight

SEE: under weight.

Löwenstein-Jensen medium

A ...

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