A large concrete block with a groove in the bottom face and a tongue on the top face to eliminate slippage when they are stacked. There is also a steel loop on the top face to facilitate lifting. The blocks are stacked in an offset manner to create a wall for retaining earth by means of their great mass. A wall built with them can be readily dismantled and the blocks reused (in ecological fashion).

A system formed by an ecological community and its environment that functions as a unit. / The interconnectedness of organisms (plants, animals, microbes) with each other and their environment.

(ecclesiastical) Pertaining to the universal Church, representing the entire Christian world; interdenominational; sometimes by extension, interreligious. / (rare) General, universal, worldwide.

(slang) Alternative letter-case form of ecstasy (“drug”)

(Greek mythology) An oread, punished by Hera by losing her own voice and only being able to mimic that of others. / (astronomy) 60 Echo, a main belt asteroid.

A beige colour.

Of a beige colour.

(idiomatic, euphemistic) Not telling the whole truth, especially in order to present a false image of a situation; untruthful; lying. Often used with sarcasm or satire.

(pathology) A non-contagious acute or chronic inflammation of the skin, characterized by redness, itching, and the outbreak of oozing vesicular lesions which become encrusted and scaly.

A level or rank in an organization, profession, or society. / (cycling) A line of riders seeking maximum drafting in a crosswind, resulting in a diagonal line across the road.