"underlayered" meaning in English

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  "lang_code": "en",
  "pos": "verb",
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          "ref": "2015 August 18, Jiexia Chen et al., “Serum biomarkers VEGF-C and IL-6 are associated with severe human Peripheral Artery Stenosis”, in Journal of Inflammation (London, England), volume 12, →DOI",
          "text": "Each tube was then underlayered with 15 mL of hypertonic Ficoll.",
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      "form_of": [
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          "word": "underlayer"
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        "simple past and past participle of underlayer"
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          "underlayer#English"
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  "word": "underlayered"
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  "lang_code": "en",
  "pos": "verb",
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          "text": "Each tube was then underlayered with 15 mL of hypertonic Ficoll.",
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      ],
      "form_of": [
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          "word": "underlayer"
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