ecto- /ek-tō- or ek-tə-/

(often interchanging with exo-) denoting outside, opp to endo- and ento-

ecˈtoblast noun (Gr blastos a shoot or bud; biology)

The outer layer of cells in a gastrula, the epiblast

ectoblasˈtic adjective

ecˈtocrine noun

An organic substance released in minute amounts by an organism into the environment, which exerts an effect on its own and other species' form, development or behaviour

ecˈtoderm noun (Gr derma skin; biology)

1. The outer layer of cells forming the wall of a gastrula
2. The tissues directly derived from this layer (also exˈoderm)

ectodermˈal or ectodermˈic adjective

ectoenˈzyme noun

An exoenzyme

ectogenˈesis noun (Gr genesis generation; biology)

1. Development outside the body
2. Variation in response to outside conditions

ectogenetˈic adjective

Produced by or characteristic of ectogenesis

ectogenˈic adjective

1. Of external origin
2. Ectogenous

ectogenous /ek-tojˈə-nəs/ adjective (biology)

Capable of living independently, or outside the body of the host (as some parasites)

ectogˈeny noun

The effect of pollen on the tissues of a plant

ecˈtomorph noun

1. (Gr morphē form) a person of light and delicate build, thought to accompany a type of personality characterized by alertness, inhibition and intellectual activity
2. Cf endomorph and mesomorph

ectomorphˈic adjective

ecˈtomorphy noun

ectoparˈasite noun

An external parasite

ectoparasitˈic adjective

ecˈtophyte noun (Gr phyton a plant; botany)

A vegetable ectoparasite

ectophytic /-fitˈik/ adjective

ecˈtoplasm noun

1. (Gr plasma something moulded) the outer layer of cytoplasm of a cell (biology)
2. A substance believed by some spiritualists to emanate from the body of a medium

ectoplasˈmic adjective

ectoplasˈtic adjective

Ectoprocˈta same as Polyzoa (see under poly-)

ecˈtosarc noun (Gr sarx, sarkos flesh; zoology)

Ectoplasm

ecˈtotherm noun

A cold-blooded animal

ectothermˈic adjective

ectothermˈy noun

ectotrophˈic adjective (Gr trophē food; botany)

Of a mycorrhiza, having its hyphae mainly on the outside of the root that it feeds

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