cartilaginous fishes having horizontally flattened bodies and enlarged winglike pectoral fins with gills on the underside; most swim by moving the pectoral fins | (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance |
any of the stiff bony spines in the fin of a fish | the apparent enlargement of a bright object when viewed against a dark background |
the syllable naming the second (supertonic) note of any major scale in solmization | (Pavolvian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus |
a column of light (as from a beacon) | (physiology) the spread of sensory neural impulses in the cortex |
a group of nearly parallel lines of electromagnetic radiation | a column of light (as from a beacon) |
a branch of an umbel or an umbelliform inflorescence | the condition of being exposed to radiation |
(mathematics) a straight line extending from a point | |