Dorland's Word of the Day is a great way to broaden your knowledge of medical terminology. With a new and interesting term brought to you from the 32nd edition of Dorland's Illustrated Medical Dictionary each day, it's an easy and fun way to increase your medical vocabulary!

You can view a new word on this website each day.

Today's Word

codominant allele
one of two or more alleles at a locus that are each fully expressed in a heterozygote and thus each contribute to the phenotype.

Word of the Day Archive

bactericidal activity
the rate of killing of bacteria in a given inoculum by a particular antibiotic or disinfectant; for effective treatment it should be at least 99.9 percent.

the presence of two cell lines in only a single sample in amniocentesis or chorionic villus sampling; considered to be due to cell culture artifacts.

terminal saccular period
the period or phase of prenatal lung development lasting, in different parts of the lungs, from the twenty-sixth week or later until near term, and followed by the alveolar period. Walls of the air spaces become thinner and the spaces divide into alveolar saccules with adjacent capillaries; type I and type II alveolar cells begin functioning and surfactant is secreted. Called also terminal saccular phase.

the presence in an individual of small numbers of cells or small amounts of DNA derived from another genetically distinct individual, as of donor cells in a graft recipient or of cells transferred between mother and fetus during pregnancy.

abembryonic pole
the pole of the blastocyst opposite the embryonic pole, that is, further away from the embryoblast; this location is the site of trypsinlike activity that is responsible for the shedding of the zona pellucida.

Nosema connori
a species of protozoa that causes corneal and disseminated infections in humans.

pseudoglandular period
the period or phase of prenatal lung development lasting from about the sixth to the sixteenth week, and followed by the canalicular period. Repeated branching of bronchi and bronchioles takes place to form primordial conductive airways, and the lungs resemble exocrine glands. Fetuses delivered during this phase are not viable because the lungs are not capable of respiration until the twenty-fourth to twenty-sixth week. Called also pseudoglandular phase.


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