(cardiology) Initialism of electrocardiogram.

Initialism of East Central German.

(astronomy) An alignment of astronomical objects whereby one object comes between the observer (or notional observer) and another object, thus obscuring the latter.

(transitive) Of astronomical or atmospheric bodies, to cause an eclipse. / (transitive, figuratively) To overshadow; to be better or more noticeable than. / (Irish grammar) To undergo eclipsis.

The use of echoes to detect objects as observed in bats and other natural creatures. Also known as biosonar.

A reflected sound that is heard again by its initial observer. / An utterance repeating what has just been said.

(of a sound or sound waves, intransitive) To reflect off a surface and return. / (transitive) To reflect back (a sound). / (by extension, transitive) To repeat (another's speech, opinion, etc.).

(biology) The branch of biology dealing with the relationships of organisms with their environment and with each other.

(obsolete) The regular operation of nature in the generation, nutrition and preservation of animals or plants.

Cheap to run; using minimal resources; representing good value for money; economical.