Or conundrum; Verbal puzzle or question that offers clues rather than direct aids to solving it, and often involves unlikely comparisons. Riddles poems were common in Old English poetry.
In ancient literature, finding the answer to a riddle could be a matter of life and death. Oedipus, for example, became the ruler of the ancient Greek city of Thebes by solving the riddle of the Sphinx: “What goes on four legs in the morning, two in the afternoon, and three in the evening?” The answer is a human being—crawling on all fours as a baby, and walking with a stick in old age.
1. A coarse sieve (as for gravel).
2. A difficult problem; SYN. conundrum, enigma, brain-teaser.
ETYM Old Eng. scren, Old Fren. escrein, escran, French écran, of uncertain origin; cf. German schirm a screen, Old High Germ. scirm, scerm a protection, shield, or German schragen a trestle, a stack of wood, or German schranne a railing.
1. A covering that serves to conceal or shelter something; SYN. cover, covert, concealment.
2. A white or silvered surface where pictures can be projected for viewing; SYN. silver screen, projection screen.
3. A decorative frame or panel serving to divide a space.
4. A metallic netting mounted in a frame and covering windows or doors for protection (especially against insects).
5. The surface of the large end of a cathode-ray tube on which an electronically created image is formed; SYN. crt screen.
sieve / sɪv /
A device with meshes or perforations through which finer particles of a mixture (as of ashes, flour, or sand) of various sizes may be passed to separate them from coarser ones, through which the liquid may be drained from liquid-containing material, or through which soft materials may be forced for reduction to fine particles