If you are going to quote a
dictionary, please first ensure you are quoting it properly and without misrepresenting the contents and b) that in cases wherein a definition has multiple potential meanings it lists the different uses from common to uncommon.
As per the actual 1828 Noah Webster's dictionary, which you can find here https://archive.org/details/noah-websters-1828-dictionary-el..., on page 7828, the definition of "Milk" is:
MILK, n.
1. A white fluid or liquor, secreted by certain glands in female animals, and drawn from the breasts for the nourishment of their young.NWAD MILK.2
2. The white juice of certain plants.NWAD MILK.3
3. Emulsion made by bruising seeds.NWAD MILK.4
And, just in case the commonality of milk being milk from a cow, see also the other shorthand definitions noted on pages 987 and 988 of the table of contents.
MILKEN, a. Consisting of milk. [Not used.]
MILKER, n. One that milks.
MILK-FEVER, n. A fever which accompanies the first flowing of milk in females after childbirth.
MILK-HEDGE, n. A shrub growing on the Coromandel coast, containing a milky juice.
MILKINESS, n. Qualities like those of milk; softness.
MILK-LIVERED, a. Cowardly; timorous.
MILKMAID, n. A woman that milks or is employed in the dairy.
MILKMAN, n. A man that sells milk or carries milk to market.
MILKPAIL, n. A pail which receives the milk drawn from cows.
MILKPAN, n. A pan in which milk is set.
MILKPORRIDGE, MILKPOTTAGE, n. A species of food composed of milk or milk and water, boiled with meal or flour.
MILKSCORE, n. An account of milk sold or purchased in small quantities, scored or marked.
MILKSOP, n. A soft, effeminate, feeble-minded man.
MILK-THISTLE, n. A plant of the genus Carduus.
MILKTOOTH, n. The fore tooth of a foal, which is cast within two or three years.
MILK-TREFOIL, n. A plant, the cytisus.
MILK-VETCH, n. A plant of the genus Astragalus.
MILK-WORT, n. A plant of the genus Euphorbia; spurge.
MILK-WEED, n. A plant, the Asclepias Syriaca.
MILKWHITE, a. White as milk.
MILKWOMAN, n. A woman that sells milk.
MILKY, a. Made of milk.
Specifically note the commonality of milk dash thing when it refers to plants. Not that it's particularly relevant, aside from the actual commonly used definition of milk already provides an example of milk being commonly understood as milk. As an additional example, look to the definition of mentioning almond milk on page 2134. Specifically note that it says milk of almonds, and not just milk.
AMYGDALATE, a. [L. amygdalus, an almond.] Made of almonds.
AMYGDALATE, n. An emulsion made of almonds; milk of almonds.
As you can see, I care way to much about milk.