umbra-, umbro-, umbr-, umbel- +

1. Departure from the shadows.
2. Getting away from the shade.

Shadowy; shady.

Giving a faint shadow, or slight resemblance.

1. To give an incomplete or faint outline or indication of something.
2. To give a vague indication or warning of something to come.
3. To overshadow and obscure something.
4. To give a faint shadow, or slight likeness; to exhibit a faint resemblance, like a shadow.

1. The act of making a shadow or faint resemblance.
2. The shadowing or partial concealment of an area.
3. A faint sketch; an imperfect representation of a thing.
4. In heraldry, the shadow only of a figure, outlined, and painted of a color darker than the field.

In sea-blubbers; a reference to the upper surface of the velum or marginal ridge, which is turned towards the umbrella or disc, in opposition to the abumbrellar or lower surface.

The convex oral surface of the umbrella of a medusa (jelly fish).

1. With some structure overhanging the parts so as partially to conceal them.
2. To shade; to darken; to cloud.

1. In astronomy, a partial outer shadow that is lighter than the darker inner shadow (umbra); that is, the area between complete darkness and complete light in an eclipse.
2. In astronomy, a grayish area surrounding the dark center of a sunspot.
3. An indistinct area, especially a state in which something is unclear or uncertain.
4. The outer region or periphery of something.

We are but dust and shadow.

1. Lacking light or brightness and producing a dull, dark, or melancholy atmosphere.
2. Having a color or tone that is dark, dull, or suitable for a serious mood or occasion.
3. Marked by or conveying strict seriousness combined with sadness or a troubled state of mind.

Via French, "gloomy", ultimately from late Latin subumbrare, “to shadow" from sub, "under" plus umbra, "shade"; the source of English umbrage.

In a somber manner: that is, with a gloomy, depressing, or dismal attitude.

A straw or felt hat with a very wide upturned brim, originally worn by men in Mexico and some other Spanish-speaking countries.

Via Spanish, "hat", from sombra "shade"; previously from Vulgar Latin sumombrare.

The concave oral surface of the umbrella of a medusa (jelly fish); the concave inner surface of the medusoid bell.

1. In botany [diminutive of umbra, shadow], a flat-topped or rounded flower cluster (umbrella-shaped flower head) in which the individual flower stalks spring from about the same point in an axis, as in the carrot, parsley, dill, fennel, and related plants.
2. A typically umbrella-shaped inflorescence in which all pedicels arise at the apex of an axis; commonly compound.