Keystone Name Definition. A keystone is the central stone placed at the top of an arch. keystone mutualists are organisms that participate in mutually beneficial interaction, the loss of which would have a profound impact upon the ecosystem as a whole.
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keystone (n.) stone in the middle of an arch (typically the uppermost stone), which holds up the others, 1630s, earlier simply key (1520s), from key (n.1) in figurative. In this paper the concept of keystone plant. Coign , coigne , quoin the keystone of an arch type of:
How to pronounce Keystone English pronunciation YouTube
The middle stone in the top of an arch that has a special shape and holds all the other stones…. 1 / 4. the keystone is the topmost stone in the arch. Coign , coigne , quoin the keystone of an arch type of:
