ectomorphic
adjective
ec·to·mor·phic ˌek-tə-ˈmȯr-fik 
1
: of or relating to the component in W. H. Sheldon's classification of body types that measures the body's degree of slenderness, angularity, and fragility
2
: characterized by a lean slender body build with slight muscular development
Example Sentences
Recent Examples on the Web These include the high-altitude environments in which many Kenyans are born and raised, widespread early exposure to running as a means of transportation, and the long-legged, ectomorphic body type that is common among Kenyans. 
Matt Fitzgerald, Outside Online, 27 July 2015
Matt Fitzgerald, Outside Online, 27 July 2015 Word History
Etymology
ectoderm + -morphic; from the predominance in such types of structures developed from the ectoderm
First Known Use
1940, in the meaning defined at sense 1
Medical Definition
ectomorphic
adjective
ec·to·mor·phic ˌek-tə-ˈmȯr-fik
1
: of or relating to the component in W. H. Sheldon's classification of body types that measures the body's degree of slenderness, angularity, and fragility compare endomorphic sense 1, mesomorphic sense 2a
2
: having a light body build compare endomorphic sense 2, mesomorphic sense 2b
ectomorphic
adjective
as in willowy
Synonyms & Similar Words
Relevance
- willowy
- lanky
- spindly
- weedy
- svelte
- rangy
- sylphlike
- reedy
- twiggy
- sinewy
- rawboned
- stringy
- waspish
- angular
- skinny
- bony
- spindling
- gaunt
- slender
- lean
- skeletal
- lank
- emaciated
- thin
- boney
- scrawny
- haggard
- cadaverous
- anorexic
- slim
- puny
- scraggy
- pinched
- spare
- wasted
- slight
Antonyms & Near Antonyms
- obese
- overweight
- chubby
- corpulent
- pudgy
- fat
- rotund
- fleshy
- tubby
- portly
- lardy
- plump
- blubbery
- stocky
- podgy
- thickset
- gross
- heavyset
- full
- round
- beefy
- bulky
- replete
- thick
- stout
- heavy
- chunky
- weighty
- burly
- roly-poly
- brawny
- plumpish
- husky
- hefty
- golden rule
- golden rust
- golden samphire
- golden saxifrage
- golden section
- golden shad
- golden shiner
- golden shower
- golden silk orb weaver
- golden silk spider
- golden slipper
- golden spider lily
- golden spleen
- golden spoon
- golden star
- golden stool
- golden syrup
- golden text
- golden thistle
- golden thread
- golden ticket
- golden tickets
- golden trout
- golden tuft
- golden warbler