um [a prolonged m sound, əm] -interj

  1. used to indicate hesitation
    • well, um, I don't know

uma·mi [ü-'mä-mē] -n

  1. a taste sensation that is meaty or savory and is produced by several amino acids and nucleotides (as glutamate and aspartate)

Umay·yad [ü-'mī-əd] -n

  1. a member of a dynasty of caliphs based in Damascus that ruled from A.D. 661 to 750

um·bel ['əm-bəl] -n

  1. a racemose inflorescence typical of the carrot family in which the pedicels arise from about the same point to form a flat or rounded flower cluster

um·bel·late ['əm-bə-,lāt, ,əm-'be-lət] -adj

  1. bearing, consisting of, or arranged in umbels
  2. resembling an umbel in form

um·bel·li·fer [,əm-'be-lə-fər] -n

  1. a plant of the carrot family

um·bel·lif·er·ous [,əm-bə-'li-f(ə-)rəs] -adj

  1. of or relating to the carrot family
    • umbelliferous flower heads

um·ber ['əm-bər] -n

  1. a brown earth that is darker in color than ocher and sienna because of its content of manganese and iron oxides and is highly valued as a permanent pigment either in the raw or burnt state
  2. a moderate to dark yellowish brown
  3. a moderate brown

umber [-b(ə-)riŋ] -vt

  1. to darken with or as if with umber
  2. of, relating to, or having the characteristics of umber
  3. of the color of umber

um·bil·i·cal [,əm-'bi-li-kəl, Brit also ,əm-bə-'lī-kəl] -adj

  1. of, relating to, or used at the navel
  2. of or relating to the central region of the abdomen
  3. being a necessary or nurturing link or connection
    • the town's umbilical rail line

umbilical -n

  1. umbilical cord

umbilical cord -n

  1. a cord arising from the navel that connects the fetus with the placenta and through which respiratory gases, nutrients, and wastes pass
  2. yolk stalk
  3. a tethering or supply line (as for an astronaut outside a spacecraft or a diver underwater)
  4. a necessary, supportive, or nurturing link or connection

um·bil·i·cate [,əm-'bi-li-kət] -adj, n

  1. depressed like a navel
  2. having an umbilicus

um·bi·li·cus [,əm-'bi-li-kəs, ,əm-bə-'lī-] -n

  1. navel
  2. any of several morphological depressions
  3. hilum
  4. a central point : core, heart

um·bles ['əm-bəlz] -n pl

  1. the edible viscera of an animal and esp. of a deer or hog

um·bo ['əm-(,)bō] -n, adj

  1. the boss of a shield
  2. : a rounded elevation: as
  3. an inward projection of the tympanic membrane of the ear
  4. one of the lateral prominences just above the hinge of a bivalve shell

um·bra ['əm-brə] -n, adj

  1. a shaded area
  2. a conical shadow excluding all light from a given source
  3. the conical part of the shadow of a celestial body excluding all light from the primary source
  4. the central dark part of a sunspot

um·brage ['əm-brij] -n

  1. shade, shadow
  2. shady branches : foliage
  3. an indistinct indication : vague suggestion : hint
  4. a reason for doubt : suspicion
  5. a feeling of pique or resentment at some often fancied slight or insult
    • took umbrage at the speaker's remarks

um·bra·geous [,əm-'brā-jəs] -adj, adv, n

  1. affording shade
  2. spotted with shadows
  3. inclined to take offense easily

um·brel·la [,əm-'bre-lə, esp Southern 'əm-,] -n

  1. a collapsible shade for protection against weather consisting of fabric stretched over hinged ribs radiating from a central pole
  2. a small one for carrying in the hand
  3. the bell-shaped or saucer-shaped largely gelatinous structure that forms the chief part of the body of most jellyfishes
  4. : something which provides protection: as
  5. defensive air cover (as over a battlefront)
  6. a heavy barrage
  7. something which covers or embraces a broad range of elements or factors
    • decided to expand...by building new colleges under a federation umbrella -- Diane Ravitch

umbrella -vt

  1. to protect, cover, or provide with an umbrella

umbrella plant -n

  1. a perennial sedge ( Cyperus alternifolius) of Madagascar that has large terminal whorls of slender leaves and is often grown as an ornamental

umbrella tree -n

  1. any of various trees or shrubs resembling an umbrella esp. in the arrangement of leaves or the shape of the crown
  2. a widely cultivated schefflera ( Schefflera actinophyllasyn. Brassaia actinophylla) of Australia and New Guinea having leaflets radiating from an elongate petiole

Um·bri·an ['əm-brē-ən] -n, adj

  1. a native or inhabitant of Umbria
  2. the Italic language of ancient Umbria

Um·bun·du [,əm-'bu̇n-(,)dü] -n

  1. a Bantu language of central Angola

umi·ak ['ü-mē-,ak] -n

  1. an open Eskimo boat made of a wooden frame covered with hide

um·laut ['üm-,lau̇t, 'u̇m-] -n

  1. the change of a vowel (as u to e in goose, geese) that is caused by partial assimilation to a succeeding sound or that occurs as a reflex of the former presence of a succeeding sound which has been lost or altered
  2. a vowel resulting from such partial assimilation
  3. a diacritical mark placed over a vowel to indicate a more central or front articulation

umlaut -vt

  1. to produce by umlaut
  2. to write or print an umlaut over

ump ['əmp] -n

  1. umpire
  2. to act as umpire

um·pire ['əm-,pī(-ə)r] -n

  1. : one having authority to decide finally a controversy or question between parties: as
  2. one appointed to decide between arbitrators who have disagreed
  3. an impartial third party chosen to arbitrate disputes arising under the terms of a labor agreement
  4. an official in a sport who rules on plays
  5. a military officer who evaluates maneuvers

umpire -vb

  1. to supervise or decide as umpire
  2. to act as umpire

ump·teen ['əm(p)-,tēn, ,əm(p)-'] -adj

  1. very many : indefinitely numerous

UMWA -abbr

  1. United Mine Workers of America