Ectomorphic and Thin

ectomorphic

thin

(superl.) Not full or well grown; wanting in plumpness.
(superl.) Rare; not dense or thick; -- applied to fluids or soft mixtures; as, thin blood; thin broth; thin air.
(superl.) Having little thickness or extent from one surface to its opposite; as, a thin plate of metal; thin paper; a thin board; a thin covering.
(superl.) Slight; small; slender; flimsy; wanting substance or depth or force; superficial; inadequate; not sufficient for a covering; as, a thin disguise.
(adv.) Not thickly or closely; in a seattered state; as, seed sown thin.
(superl.) Wanting in body or volume; small; feeble; not full.
(superl.) Not stout; slim; slender; lean; gaunt; as, a person becomes thin by disease.
(superl.) Not close; not crowded; not filling the space; not having the individuals of which the thing is composed in a close or compact state; hence, not abundant; as, the trees of a forest are thin; the corn or grass is thin.
(v.t.) To make thin (in any of the senses of the adjective).
(v.i.) To grow or become thin; -- used with some adverbs, as out, away, etc.; as, geological strata thin out, i. e., gradually diminish in thickness until they disappear.

Webster's Revised Unabridged Dictionary

Lose thickness; become thin or thinner.
Make thin or thinner.
- usage: "Thin the solution"
Lessen the strength or flavor of a solution or mixture.
- usage: "cut bourbon"
- synonyms: dilute, thin out, reduce, cut
Take off weight.
- synonyms: reduce, melt off, lose weight, slim, slenderize, slim down

Of relatively small extent from one surface to the opposite or in cross section.
- usage: "thin wire"; "a thin chiffon blouse"; "a thin book"; "a thin layer of paint"
Lacking excess flesh."you can't be too rich or too thin"; "Yon Cassius has a lean and hungry look-Shakespeare
- synonyms: lean
Very narrow.
- usage: "a thin line across the page"
- synonyms: slender
Not dense.
- usage: "a thin beard"; "trees were sparse"
- synonyms: sparse
Relatively thin in consistency or low in density; not viscous.
- usage: "air is thin at high altitudes"; "a thin soup"; "skimmed milk is much thinner than whole milk"; "thin oil"
Of sound. ( lacking resonance or volume)
- usage: "a thin feeble cry"
Lacking spirit or sincere effort.
- usage: "a thin smile"
Lacking substance or significance.
- usage: "slight evidence"; "a tenuous argument"; "a thin plot"; a fragile claim to fame"
- synonyms: flimsy, fragile, slight, tenuous