cartilaginous fishes having horizontally flattened bodies and enlarged winglike pectoral fins with gills on the underside; most swim by moving the pectoral fins | (genetics) a virus or other agent that is used to deliver DNA to a cell |
any of the stiff bony spines in the fin of a fish | a variable quantity that can be resolved into components |
the syllable naming the second (supertonic) note of any major scale in solmization | any agent (person or animal or microorganism) that carries and transmits a disease |
a column of light (as from a beacon) | a straight line segment whose length is magnitude and whose orientation in space is direction |
a group of nearly parallel lines of electromagnetic radiation | |
a branch of an umbel or an umbelliform inflorescence | |
(mathematics) a straight line extending from a point | |