Keyword
What KeyWord is found in the definitions of each of the following?

30 rivage, cashier's cheque, snowdrift, floodwall, teller (4 letters)
31 bay, tapa, cortex, sassafras, cascarilla (4 letters)
32 mow, silo, byre, stall, shedrow (4 letters)
33 embargo, dam, hurdle, palisade, shelterbelt (7 letters)
34 pepper, liner, putout, sacrifice, pitcher (8 letters)
35 birdbath, dishpan, playa, stoup, laver (5 letters)
36 swingman, inbounds, keyhole, backboard, shot clock (10 letters)
37 trabeated, girder, searchlight, crosstie, transom (4 letters)
38 excrescence, Vandyke, barbate, Santa Claus, goatee (5 letters)
39 Junoesque, pulchritudinous, amaranthine, exquisite, aesthete (6 letters)
40 astir, davenport, bassinet, four-poster, queen size (3 letters)
41 propolis, apivorous, supersedure, royal jelly, drone (3 letters)
42 apian, swarm, propolis, royal jelly, supersedure (3 letters)
43 mum, wort, seidel, shandy, porter (4 letters)
44 muckworm, grub, weevil, ladybug, scarab (6 letters)
45 tintinnabular, campanology, tocsin, toll, cloche (4 letters)
46 cestus, surcingle, gird, bandoleer, buckle (4 letters)
47 geniculate, bight, flexion, crook, dogleg (4 letters)
48 masse, carom, rack, miscue, bridge (9 letters)
49 Walter Gilbert, George Wald, Thomas Hunt Morgan, George Wells Beadle, Thomas Henry Huxley (9 letters)
50 nativity, multiparous, Lamaze, polycotous, congenital (5 letters)
51 jet, sable, necromancy, melanous, charcoal (5 letters)
52 dazzle, jalousie, meropia, altricial, typhlology (5 letters)
53 Beni, Titicaca, Sucre, La Paz, Tiahuanaco (7 letters)
54 salvo, UXB, Edward Teller, ground zero, dud (4 letters)

Answers: 30. bank, 31. bark, 32. barn, 33. barrier, 34. baseball, 35. basin, 36. basketball, 37. beam, 38. beard, 39. beauty, 40. bed, 41. bee, 42. bee, 43. beer, 44. beetle, 45. bell, 46. belt, 47. bend, 48. billiards, 49. biologist, 50. birth, 51. black, 52. blind, 53. Bolivia, 54. bomb,

... or try our companion Rhyme-n-Reason