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schwarzer Strahler
nat.sc.	blackbody; black body; full radiator; Planckian radiator; complete radiator
opt.	ideal black body; black-body radiator (source)
phys.	absolute blackbody; absolute black-body; black-body; blackbody radiator; black-body radiator

schwarzer Strahler: 2 phrases in 2 subjects

Optics branch of physics	1
Technology	1