The word for today is…

buttress (noun) – 1. A structure, usually brick or stone, built against a wall for support or reinforcement.
2. Something resembling a buttress, as:
(a) The flared base of certain tree trunks.
(b) A horny growth on the heel of a horse’s hoof.
3. Something that serves to support, prop, or reinforce.

Source : The Free Dictionary

Etymology : Early 14th century, “structure built against a wall to give it stability,” from Old French (arc) botrez “flying buttress,” apparently from bouter, boter “to thrust against,” a word of Frankish origin (compare Old Norse bauta “to strike, beat”), from Proto-Germanic *butan, from PIE root *bhau- “to strike.” Figurative sense “any source of support” is from mid-15th century.

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Korau
Peter is a fourth-generation New Zealander, with his mother's and father's folks having arrived in New Zealand in the 1870s. He lives in Lower Hutt with his wife, two cats and assorted computers. His work history has been in the timber, banking and real estate industries, and he's now enjoying retirement. He has been interested in computers for over thirty years and is a strong advocate for free open source software. He is chairman of the SeniorNet Hutt City committee.