a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement | cartilaginous fishes having horizontally flattened bodies and enlarged winglike pectoral fins with gills on the underside; most swim by moving the pectoral fins |
| any of the stiff bony spines in the fin of a fish |
| the syllable naming the second (supertonic) note of any major scale in solmization |
| a column of light (as from a beacon) |
| 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 |