| ECH | a diffraction grating consisting of a pile of plates of equal thickness arranged stepwise with a constant offset |
|---|---|
| ECH | a body of troops arranged in a line |
| ECH | fishes having a sucking disk on the head for clinging to other fishes and to ships |
| ECH | type genus of the Echeneididae: typical remoras |
| ECH | remoras found attached to sharks |
| ECH | burrowing spine-covered monotreme of Australia having a long snout and claws for hunting ants and termites |
| ECH | New Guinea echidnas |
| ECH | a genus of Siphonaptera |
| ECH | parasitic on especially the heads of chickens |
| ECH | small genus of North American coarse perennial herbs |
| ECH | any cactus of the genus Echinocactus |
| ECH | large cactus of east central Mexico having golden to pale yellow flowers and spines |