from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An algebraic structure similar to a ring, but without the requirement that each element must have an additive inverse.
- n. One of the incomplete rings of the upper part of the bronchial tubes of most birds, forming an essential part of the syrinx of songbirds.
from the GNU version of the Collaborative International Dictionary of English
- n. One of the incomplete rings of the upper part of the bronchial tubes of most birds. The semirings form an essential part of the syrinx, or musical organ, of singing birds.
from The Century Dictionary and Cyclopedia
- n. In zoology, a tracheal or bronchial half-ring. See tracheal rings (under ring), and cut under pessulus.
semi- + ring (Wiktionary)