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There are 14 nine-letter words beginning with ECTO

ECTOBLAST	• ectoblast n. (Dated, biology) The outer layer of the blastoderm; the ectoderm or epiblast. • ECTOBLAST n. the outer layer of the blastoderm, also EPIBLAST.
ECTOCRINE	• ectocrine adj. Producing secretions by the decomposition of organisms. • ectocrine n. Such a secretion. • ECTOCRINE n. any metabolite that is released into an organism's environment and influences the vital processes of other organisms.
ECTODERMS	• ectoderms n. Plural of ectoderm. • ECTODERM n. the external layer of an embryo, also EXODERM.
ECTOGENES	• ECTOGENE n. a gene involved in the development of an embryo in artificial conditions.
ECTOGENIC	• ectogenic adj. That originates outside of an organism. • ECTOGENIC adj. relating to ectogeny, the effect of pollen on the tissues of a plant.
ECTOMERES	• ectomeres n. Plural of ectomere. • ECTOMERE n. a cell that develops into ectoderm.
ECTOMERIC	• ectomeric adj. Of, or relating to an ectomere. • ECTOMERIC adj. like an ectomere, the more transparent cells, which finally become external, in many segmenting ova, as those of mammals.
ECTOMORPH	• ectomorph n. Someone with a lean, only slightly muscular body. • ectomorph n. (Bodybuilding): Theoretical body type in which a person has a high metabolism. Such a person can easily… • ECTOMORPH n. a psychophysical type with long thin bones and large surface relative.
ECTOPHYTE	• ectophyte n. (Biology) Any plant that lives as a parasite on the surface of another organism. • ECTOPHYTE n. a vegetable ectoparasite.
ECTOPLASM	• ectoplasm n. (Parapsychology) A visible substance believed to emanate from the body of a spiritualistic medium during… • ectoplasm n. (Parapsychology) An immaterial or ethereal substance, especially the transparent corporeal presence… • ectoplasm n. (Cytology) The outer granule-free layer of cytoplasm.
ECTOPROCT	• ectoproct n. (Dated) Synonym of bryozoan. • ECTOPROCT n. a bryozoan, a moss or liverwort.
ECTOSARCS	• ectosarcs n. Plural of ectosarc. • ECTOSARC n. the outermost layer of some protozoans.
ECTOTHERM	• ectotherm n. (Biology) An animal, such as an amphibian, fish, reptile, or arthropod, which has a limited ability… • ECTOTHERM n. a cold-blooded animal.
ECTOZOANS	• ectozoans n. Plural of ectozoan. • ECTOZOAN n. a parasite on the body of an animal, also ECTOZOON.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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English Wiktionary: 31 words
Scrabble in French: 2 words
Scrabble in Spanish: 4 words
Scrabble in Italian: 6 words
Scrabble in German: no word
Scrabble in Romanian: 4 words

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