| tyle | Synonym: callosity. Origin: G. Tyle, a swelling, a callus (05 Mar 2000) |
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| tylectomy | Surgical removal of a localised swelling or tumour. See: lumpectomy. Origin: G. Tyle, lump, + ektome, excision (05 Mar 2000) |
| tylenchida | An order of nematodes consisting of many species which are plant parasites. Female worms lay eggs that hatch either in soil or in the host plant. (12 Dec 1998) |
| tylenchoidea | A superfamily of nematodes whose members are free-living saprophytes or parasites of plants. Ova are sometimes found in human feces after ingestion of infected plants. (12 Dec 1998) |