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Webster 1913 Edition
Deltoid
Del′toid
,Adj.
[Gr.
δελτοειδήσ
delta- shaped; δέλτα
the name of the letter Δ + εἶδοσ
form: cf. F. deltoïde
. See Delta
.] 1.
Shaped like the Greek Δ (delta); delta-shaped; triangular.
Deltoid leaf
(Bot.)
, a leaf in the form of a triangle with the stem inserted at the middle of the base.
– Deltoid muscle
(Anat.)
, a large triangular muscle covering the shoulder joint, which serves to raise the arm directly upward.
Webster 1828 Edition
Deltoid
DELTOID
, n.1.
Triangular; an epithet applied to a muscle of the shoulder which moves the arm forwards, upwards and backwards.2.
In botany, shaped somewhat like a delta or rhomb, having four angles, of which the lateral ones are less distant from the base than the others; as a deltoid leaf.Trowel-shaped, having three angles, of which the terminal one is much further from the base than the lateral ones.