Simple past tense and past participle of subtend.(verb)
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Use "subtended" in a sentence
"Very small, individual, simple flowers (florets) are grouped in inflorescences called spikelets, which are subtended by small leaf-like bracts, the glumes."
"The alcohol did help to lubricate minds and bodies as we (a) considered how it was even possible to see light from stars that were so far away (the solid angle subtended at the eye must be miniscule), and (b) stumbled off on our first night safari, respectively."
"True field of view is the angle subtended by the objective lens."