194 DICTIONARY OF AVIATION
tacht clouds moving rapidly under a mass of stermscloud ;
fracto^nimbus cloud. scull skAf intr. make movements similar to those of one who
sculls a boat; make strokes with the outer portion of the
wings, turning these parts of the wings at each stroke. sea-anchor 'sii,aerjk9z n. a water-anchor attacht to an air- craft, for use at sea. sea-bird 'sii,bB:zd n. a bird that lives habitually over or
near the sea; a marine or pelagic web^footed bird; a sea*
fowl, compare land-bird. seaboard 'sii,bo:zd n. the sea^shore or sea^coast; the coaste
line of the sea or ocean. sea-breeze 'sii,bziiz n. a breeze blowing from the sea toward
the land; a diurnal breeze occurring near the sea^coast,
commonly lasting from about 10 o'clock in the forenoon
till sunset, compare land-breeze. sea-dust 'sii,dAst n. dust, usually of bricksrred color, borne
from deserts far out to sea where it appears as red feg or
sirocco^dust, or in bloodstain. sea-edge 'sii,ed3 n. the edge of the open sea or ocean next
to the ice-field; the boundaryzline between the open and
the frozen arctic sea. sea-horizon 'sri-no^ai-zan n. the horizon or circle which
bounds the view of the observer at sea; the sensible or
visible horizon of one who is upon the open ocean. sea-gull 'sii,gAt n. any bird of the subfamily Larinae most
of which fly over the sea and inland waters; also, one of
certain of the larger terns; a gull. sea-horse 'sri,he:zs n.
flying sea-horse, one of a family of fishes, the Pegasi-
dae, typified by the genus Pegasus. seam siim n. one of the lines joining the sewd or stitcht
edges of the silk or other gores of the envelop of the gasbag
of a balloon; the line of union between two contiguous
gores. sea-plane 'sii,pteen . the plane or level constituting the
surface of the sea ; the two-dimensional surface of the ocean
or sea. searchlight 'sB:zt$,lait n. a powerful light or lamp with a
parabolic reflector or lens used, as en an airship, for
searching out or illuminating distant objects. seasickness 'si^sikNis n. the state or condition of being
seasick; nausea. seat-back 'siit,baek n. the movable back of the seat or chair
occupied by the driver, as in a Curtiss aeroplane, by which
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